diff --git a/README.md b/README.md
index ec8a510..525ec32 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ keyPrefix: 'doodle-assets/',
 
 ### 新后端静默登录与鉴权
 
-启动及回到前台时通过 `utils/auth.ts` 非阻塞预热：`wx.login` 取一次性 code，调用 `POST /api/v1/auth/wechat/login`。首次使用 `start`，已有会话续期和 401 恢复使用 `resume`；明确无效 code 最多重新取一次。JWT 与用户摘要按 AppID、接口地址分开保存，凭证到期前 60 秒按需续登。不缓存角色或微信 OpenID，不记录凭证、code 或完整登录响应。
+启动及回到前台时通过 `utils/auth.ts` 非阻塞预热：`wx.login` 取一次性 code，调用 `POST /api/v1/auth/wechat/login`。首次使用 `start`，已有会话续期和 401 恢复使用 `resume`；明确无效 code 最多重新取一次。JWT 与用户摘要按 AppID、包类型、环境名称和接口地址分开保存，凭证到期前 60 秒按需续登。不缓存角色或微信 OpenID，不记录凭证、code 或完整登录响应。
 
 统一请求层 `services/api-request.ts` 默认要求登录并携带 Bearer；公开分类与题型接口显式指定 `auth: 'none'`，不携带凭证、不触发登录。受保护请求遇到可恢复 401 时最多重登并重发一次，并发请求合并登录，迟到的旧 401 不会清掉新凭证。恢复后身份变化时不补发原业务写入。403、限流、服务错误或网络失败不触发自动重登链。
 
@@ -44,10 +44,28 @@ await apiRequest('/me');
 
 ### 业务接口切换
 
-本地开发中的小程序运行代码已不再调用 `wx.cloud`；首页继续使用 `wx.getBackgroundFetchData` 获取预拉取首屏，在后台使用新 `/page-config` 刷新，管理改动也会刷新首页。旧云端的预拉取地址、生成与发布链路、定时任务保持原样，新管理开关仅控制新后端的快照刷新任务。
+本地开发中的小程序运行代码已不再调用 `wx.cloud`；体验版与正式版首页继续使用 `wx.getBackgroundFetchData` 获取预拉取首屏，在后台使用新 `/page-config` 刷新。开发版跳过旧线上预拉取，使用所选接口环境自己的内容缓存及新后端；管理改动也会刷新首页。旧云端的预拉取地址、生成与发布链路、定时任务保持原样，新管理开关仅控制新后端的快照刷新任务。
 
 当前已发布的线上版仍使用旧云开发接口。`cloudfunctions/` 中全部旧云函数源码、云开发配置及线上服务均须保留；本地开发版切换接口不代表线上旧版本已停止调用。未经另行明确安排，不删除、停用旧云函数，不改变其接口契约，不清理旧云数据库或云存储，也不迁移现有预拉取模式。
 
 用户接口由 `services/member-api.ts` 与 `utils/auth.ts` 管理，管理页由 `services/admin-api.ts` 适配具名 REST 路由。图片通过本站 multipart 上传接口进入七牛，不暴露 AK/SK；同一次上传恢复沿用 UUID uploadId。管理页只能由数据库中当前角色为 admin 的账户操作，开发版不会绕过权限。
 
 服务端路由、权限与数据迁移说明见 doodle-store 的 `docs/v3.5/小程序云接口迁移清单.md`。旧云端用户、收藏与下载历史本次未自动导入，正式切换前需要另行核对迁移。
+
+### 开发版接口环境切换
+
+入口：个人中心 → Debug 工具 → 接口环境。`develop` 可切换 `local / staging / production`，选择保存在本机，切换后自动重建页面返回首页，无需重新编译。开发版导航栏显示当前环境。`trial / release` 固定使用 `production`，忽略本机调试选择，配置层与切换入口均有校验。
+
+地址在 `miniprogram/config/api.ts` 集中配置：
+
+- `localBaseUrl`：本地开发接口。
+- `stagingBaseUrl`：未来测试接口。
+- `productionBaseUrl`：未来正式接口。
+
+目前按要求，三个地址都暂填 `http://127.0.0.1:8800/api/v1`，客户端缓存和会话按环境隔离，但实际请求仍访问同一个本地后端和数据库。真机的 `127.0.0.1` 指向手机；调试时 local 需改为电脑局域网地址。部署时把 staging/production 占位地址改为对应 HTTPS 地址，不会因地址缺失自动回退 local。
+
+切换会清空共享用户和内容状态，读取目标环境凭证，并强制从目标接口加载首页；原环境的缓存与会话保留。所有 API 响应按环境版本检查，即使快速 A→B→A，旧请求也不能覆盖当前数据。写请求（含登录等待及上传重试）未完成时禁止切换。目标接口不可用时提示连接失败并保留所选环境，不展示上一环境的内容。打印偏好继续共用。
+
+本轮仅调整开发版数据来源；体验/正式包原预拉取模式、地址及全部旧云端服务保持原样。
+
+环境切换回归：`node --import tsx --test tests/environment-switch.test.mjs`。
diff --git a/miniprogram/app.ts b/miniprogram/app.ts
index 70156b0..208d8f0 100644
--- a/miniprogram/app.ts
+++ b/miniprogram/app.ts
@@ -2,11 +2,13 @@ import { fetchPageConfig } from './services/site-api';
 import { normalizePreviewImages } from './config/assets';
 import { defaultPrintConfig } from './config/config';
 import { getUser } from './utils/auth';
+import { apiContextKey, getApiConfig, isCurrentApiConfig } from './config/api';
 import { generateUUID, getAppUUID, setAppUUID } from './utils/uuid';
 
 let _refreshGeneration = 0;
+let _loadGeneration = 0;
 
-const STORAGE_KEY_PAGE_CONFIG = 'pageConfig';
+const pageConfigStorageKey = () => `doodle_page_config_v2:${apiContextKey()}`;
 
 // Pending resolvers for getPageConfig() callers waiting on config
 let _configResolvers: Array<(config: PageConfigData | null) => void> = [];
@@ -65,6 +67,23 @@ App<IAppOption>({
 
     onHide() {},
 
+    /** 切环境不重启 App：作废旧加载、释放等待者并重置共享业务状态。 */
+    resetApiState() {
+        _refreshGeneration++;
+        _loadGeneration++;
+        this.globalData.user = null;
+        this.globalData.pageConfig = undefined;
+        this.globalData.pageConfigReady = false;
+        this.globalData.pendingCategoryTabId = undefined;
+        for (const resolve of _configResolvers) resolve(null);
+        _configResolvers = [];
+        try {
+            wx.removeStorageSync('favorites_active_tab');
+        } catch {
+            /* 临时页签偏好清理失败不影响环境与用户隔离。 */
+        }
+    },
+
     getPrintConfig(): PrintConfig {
         return this.globalData.printConfig || defaultPrintConfig;
     },
@@ -74,32 +93,54 @@ App<IAppOption>({
         wx.setStorageSync('printConfig', config);
     },
 
-    async loadPageConfig() {
+    async loadPageConfig(forceRefresh = false) {
+        let context: ReturnType<typeof getApiConfig>;
+        try {
+            context = getApiConfig();
+        } catch {
+            // 地址被移除时结束首页等待，开发者仍可进入 Debug 改选可用环境。
+            this.globalData.pageConfig = undefined;
+            this.globalData.pageConfigReady = true;
+            for (const resolve of _configResolvers) resolve(null);
+            _configResolvers = [];
+            return false;
+        }
+        const generation = ++_loadGeneration;
+        const current = () =>
+            generation === _loadGeneration && isCurrentApiConfig(context);
+        const storageKey = pageConfigStorageKey();
         let config: PageConfigData | null = null;
 
-        // L1: 数据预拉取
-        try {
-            const res = await new Promise<{ fetchedData: string }>(
-                (resolve, reject) => {
-                    wx.getBackgroundFetchData({
-                        fetchType: 'pre',
-                        success: resolve as any,
-                        fail: reject,
-                    });
-                },
-            );
-            if (res.fetchedData) {
-                const parsed = JSON.parse(res.fetchedData);
-                config = parsed?.data || parsed;
+        // 仅开发版跳过旧线上预拉取，保证环境切换后的内容来自目标服务。
+        // 体验/正式版继续沿用原预拉取模式、地址与旧云端任务。
+        if (context.version !== 'develop')
+            try {
+                const res = await new Promise<{ fetchedData: string }>(
+                    (resolve, reject) => {
+                        wx.getBackgroundFetchData({
+                            fetchType: 'pre',
+                            success: resolve as any,
+                            fail: reject,
+                        });
+                    },
+                );
+                if (res.fetchedData) {
+                    const parsed = JSON.parse(res.fetchedData);
+                    config = parsed?.data || parsed;
+                }
+            } catch {
+                // 预拉取失败，继续降级
             }
-        } catch {
-            // 预拉取失败，继续降级
-        }
+        if (!current()) return false;
 
         // L2: storage 缓存
-        if (!config) {
+        if (!config && !forceRefresh) {
             try {
-                const cached = wx.getStorageSync(STORAGE_KEY_PAGE_CONFIG);
+                const cached =
+                    wx.getStorageSync(storageKey) ||
+                    (context.version !== 'develop'
+                        ? wx.getStorageSync('pageConfig')
+                        : null);
                 if (cached && typeof cached === 'object') {
                     config = cached;
                 }
@@ -117,6 +158,7 @@ App<IAppOption>({
                 /* 新后端不可用时继续展示空状态，本地生成仍可使用。 */
             }
         }
+        if (!current()) return false;
 
         // 三种数据入口都先转换预览图，旧缓存会随成功加载写回新地址。
         config = normalizePreviewImages(config);
@@ -126,7 +168,7 @@ App<IAppOption>({
             this.globalData.pageConfig = config;
             // 成功获取后写入 storage 缓存
             try {
-                wx.setStorageSync(STORAGE_KEY_PAGE_CONFIG, config);
+                wx.setStorageSync(storageKey, config);
             } catch {
                 // storage 写入失败不影响主流程
             }
@@ -140,16 +182,23 @@ App<IAppOption>({
         _configResolvers = [];
         // 预拉取/缓存先渲染，再用新后端刷新，避免旧静态配置长期覆盖管理修改。
         if (hadCachedConfig) void this.refreshPageConfig();
+        return !!config;
     },
 
     async refreshPageConfig() {
+        const context = getApiConfig();
+        const storageKey = pageConfigStorageKey();
         const generation = ++_refreshGeneration;
         try {
             const config = normalizePreviewImages(await fetchPageConfig());
-            if (generation !== _refreshGeneration) return;
+            if (
+                generation !== _refreshGeneration ||
+                !isCurrentApiConfig(context)
+            )
+                return;
             this.globalData.pageConfig = config;
             try {
-                wx.setStorageSync(STORAGE_KEY_PAGE_CONFIG, config);
+                wx.setStorageSync(storageKey, config);
             } catch {
                 /* 缓存失败不影响当前数据。 */
             }
diff --git a/miniprogram/components3.0/nav-bar/nav-bar.less b/miniprogram/components3.0/nav-bar/nav-bar.less
index 649becc..bec2f9f 100644
--- a/miniprogram/components3.0/nav-bar/nav-bar.less
+++ b/miniprogram/components3.0/nav-bar/nav-bar.less
@@ -66,13 +66,21 @@
     margin-top: 4rpx;
 }
 
+.nav-bar__title-group {
+    display: flex;
+    align-items: center;
+    gap: 12rpx;
+    flex: 1;
+    min-width: 0;
+}
+
 .nav-bar__title {
     font-size: @fs-nav-title;
     font-weight: @fw-nav-title;
     color: @color-nav-title;
     letter-spacing: @ls-nav-title;
     line-height: 1;
-    flex: 1;
+    flex: 0 1 auto;
     min-width: 0;
 }
 
@@ -86,4 +94,14 @@
 .nav-bar__placeholder {
     width: 100%;
     flex-shrink: 0;
-}
\ No newline at end of file
+}
+.nav-bar__environment {
+    margin-right: 16rpx;
+    padding: 6rpx 12rpx;
+    border-radius: 12rpx;
+    background: @brand;
+    color: @text-title;
+    font-size: 20rpx;
+    line-height: 1.2;
+    flex-shrink: 0;
+}
diff --git a/miniprogram/components3.0/nav-bar/nav-bar.ts b/miniprogram/components3.0/nav-bar/nav-bar.ts
index c135c27..085f1cf 100644
--- a/miniprogram/components3.0/nav-bar/nav-bar.ts
+++ b/miniprogram/components3.0/nav-bar/nav-bar.ts
@@ -1,4 +1,5 @@
 import { getNavInnerPx } from '../../utils/navMetrics';
+import { getApiEnvironment } from '../../config/api';
 
 const HOME_TAB_URL = '/pages/home/home';
 const HOME_ROUTE = 'pages/home/home';
@@ -24,6 +25,7 @@ Component({
         leftActionType: 'none' as 'none' | 'back' | 'home' | 'brand',
         /** 仅首页（Tab 根页）在 logo 旁展示「涂鸦丫」；其余主 Tab 只展示 logo */
         showBrandName: false,
+        apiEnvironment: '',
     },
     lifetimes: {
         attached() {
@@ -44,6 +46,12 @@ Component({
     },
     methods: {
         syncLeftAction() {
+            this.setData({
+                apiEnvironment:
+                    wx.getAccountInfoSync().miniProgram.envVersion === 'develop'
+                        ? getApiEnvironment()
+                        : '',
+            });
             const pages = getCurrentPages();
             const currentRoute = pages[pages.length - 1]?.route || '';
             const isTabBarPage = TAB_BAR_ROUTES.has(currentRoute);
diff --git a/miniprogram/components3.0/nav-bar/nav-bar.wxml b/miniprogram/components3.0/nav-bar/nav-bar.wxml
index cd296b2..58f2268 100644
--- a/miniprogram/components3.0/nav-bar/nav-bar.wxml
+++ b/miniprogram/components3.0/nav-bar/nav-bar.wxml
@@ -22,7 +22,12 @@
                 wx:elif="{{leftActionType === 'home'}}"
                 class="toy-icon toy-icon-home-o nav-bar__back-icon"></text>
         </view>
-        <text class="nav-bar__title">{{title}}</text>
+        <view class="nav-bar__title-group">
+            <text class="nav-bar__title">{{title}}</text>
+            <text wx:if="{{apiEnvironment}}" class="nav-bar__environment"
+                >{{apiEnvironment}}</text
+            >
+        </view>
         <view class="nav-bar__right">
             <slot name="right"></slot>
         </view>
diff --git a/miniprogram/config/api.ts b/miniprogram/config/api.ts
index 9c84c67..409a6de 100644
--- a/miniprogram/config/api.ts
+++ b/miniprogram/config/api.ts
@@ -1,37 +1,122 @@
-export type ApiEnvironment = 'local' | 'online';
+export type ApiEnvironment = 'local' | 'staging' | 'production';
 type MiniProgramVersion = 'develop' | 'trial' | 'release';
 
-/** 统一接口入口；本地真机调试时将 localBaseUrl 的 IP 改为电脑局域网 IP。 */
+const LOCAL_BASE_URL = 'http://127.0.0.1:8800/api/v1';
+const STORAGE_KEY = 'doodle_develop_api_environment_v1';
+let selectedEnvironment: ApiEnvironment | undefined;
+let revision = 0;
+
+/** 暂时共用本地地址；部署后分别替换 staging/production，真机 local 使用电脑局域网 IP。 */
 export const apiConfig = {
     developmentEnvironment: 'local' as ApiEnvironment,
-    localBaseUrl: 'http://127.0.0.1:8800/api/v1',
-    // 线上域名尚未确定：填写完整 HTTPS 地址，例如 https://你的域名/api/v1。
-    onlineBaseUrl: '',
+    localBaseUrl: LOCAL_BASE_URL,
+    stagingBaseUrl: LOCAL_BASE_URL,
+    productionBaseUrl: LOCAL_BASE_URL,
     timeout: 10000,
 };
 
-/** develop 可切换本地/线上；体验版、正式版和未知运行环境均只允许线上入口。 */
-export function resolveApiConfig(version: MiniProgramVersion | string) {
-    const environment: ApiEnvironment =
-        version === 'develop' ? apiConfig.developmentEnvironment : 'online';
-    const baseUrl = (
-        environment === 'local'
-            ? apiConfig.localBaseUrl
-            : apiConfig.onlineBaseUrl
-    )
-        .trim()
-        .replace(/\/+$/, '');
-    if (!baseUrl) throw new Error('请先配置线上接口地址');
-    if (
-        !/^https?:\/\/[^/?#\s]+\/api\/v1$/.test(baseUrl) ||
-        (environment === 'online' && !baseUrl.startsWith('https://'))
-    ) {
-        throw new Error('接口地址配置不正确');
-    }
-    return { environment, baseUrl, timeout: apiConfig.timeout };
+export const API_ENVIRONMENTS: ApiEnvironment[] = [
+    'local',
+    'staging',
+    'production',
+];
+
+export function isApiEnvironment(value: unknown): value is ApiEnvironment {
+    return API_ENVIRONMENTS.includes(value as ApiEnvironment);
 }
 
-/** 请求时读取微信包版本，避免依赖 App 启动顺序，也不接受本地缓存覆盖正式版环境。 */
-export function getApiConfig() {
-    return resolveApiConfig(wx.getAccountInfoSync().miniProgram.envVersion);
+/** 仅开发包读取本机选择；体验、正式及未知包始终连接 production。 */
+export function getApiEnvironment(
+    version: string = wx.getAccountInfoSync().miniProgram.envVersion,
+): ApiEnvironment {
+    if (version === 'develop' && selectedEnvironment === undefined) {
+        try {
+            const stored: unknown = wx.getStorageSync(STORAGE_KEY);
+            if (isApiEnvironment(stored)) selectedEnvironment = stored;
+        } catch {
+            /* 无缓存时使用开发默认值。 */
+        }
+    }
+    return version === 'develop'
+        ? (selectedEnvironment ?? apiConfig.developmentEnvironment)
+        : 'production';
+}
+
+export function resolveApiConfig(version: MiniProgramVersion | string) {
+    return resolveEnvironment(getApiEnvironment(version), version);
+}
+
+function resolveEnvironment(environment: ApiEnvironment, version: string) {
+    const baseUrl = apiConfig[`${environment}BaseUrl`]
+        .trim()
+        .replace(/\/+$/, '');
+    if (!baseUrl) throw new Error(`请先配置 ${environment} 接口地址`);
+    // 用户指定的本机占位地址暂允许 HTTP；实际云端入口仍须使用 HTTPS。
+    if (
+        !/^https?:\/\/[^/?#\s]+\/api\/v1$/.test(baseUrl) ||
+        (environment !== 'local' &&
+            !baseUrl.startsWith('https://') &&
+            baseUrl !== LOCAL_BASE_URL)
+    )
+        throw new Error('接口地址配置不正确');
+    return {
+        environment,
+        baseUrl,
+        timeout: apiConfig.timeout,
+        revision,
+        version,
+    };
+}
+
+export function getApiConfig() {
+    const { appId = '', envVersion } = wx.getAccountInfoSync().miniProgram;
+    return { ...resolveApiConfig(envVersion), appId };
+}
+
+/** 即使三个地址相同也按环境隔离；develop 不与体验/正式包共享业务缓存。 */
+export function apiContextKey(config = getApiConfig()): string {
+    const scope = config.version === 'develop' ? 'develop' : 'public';
+    return [config.appId, scope, config.environment, config.baseUrl]
+        .map(encodeURIComponent)
+        .join(':');
+}
+
+/** 版本号阻止 A→B→A 后旧 A 请求覆盖当前页面。 */
+export function isCurrentApiConfig(config: ReturnType<typeof getApiConfig>) {
+    const current = getApiConfig();
+    return (
+        config.revision === current.revision &&
+        apiContextKey(config) === apiContextKey(current)
+    );
+}
+
+/** 写入成功后才提交内存选择；配置失败保留原环境，不自动回退。 */
+export function selectApiEnvironment(environment: ApiEnvironment): boolean {
+    if (wx.getAccountInfoSync().miniProgram.envVersion !== 'develop')
+        throw new Error('仅开发版可切换环境');
+    if (!isApiEnvironment(environment)) throw new Error('未知接口环境');
+    resolveEnvironment(environment, 'develop');
+    if (getApiEnvironment() === environment) return false;
+    wx.setStorageSync(STORAGE_KEY, environment);
+    selectedEnvironment = environment;
+    revision++;
+    return true;
+}
+
+export function getApiEnvironmentOptions() {
+    return API_ENVIRONMENTS.map((environment) => {
+        try {
+            return {
+                environment,
+                baseUrl: resolveEnvironment(environment, 'develop').baseUrl,
+                available: true,
+            };
+        } catch {
+            return {
+                environment,
+                baseUrl: '尚未配置有效地址',
+                available: false,
+            };
+        }
+    });
 }
diff --git a/miniprogram/pages/profile/profile.less b/miniprogram/pages/profile/profile.less
index 12ed229..ef83d7e 100644
--- a/miniprogram/pages/profile/profile.less
+++ b/miniprogram/pages/profile/profile.less
@@ -430,14 +430,17 @@ page {
 }
 
 .profile-editor__actions {
-    display: grid;
-    grid-template-columns: repeat(2, minmax(0, 1fr));
-    gap: 24rpx;
+    display: flex;
     padding-top: 20rpx;
 }
 
 .profile-editor__action {
+    flex: 1;
+    min-width: 0;
     height: 92rpx;
+    margin: 0;
+    padding: 0;
+    border: 0;
     border-radius: 24rpx;
     display: flex;
     align-items: center;
@@ -447,6 +450,14 @@ page {
     font-weight: 700;
 }
 
+.profile-editor__action::after {
+    border: 0;
+}
+
+.profile-editor__action + .profile-editor__action {
+    margin-left: 24rpx;
+}
+
 .profile-editor__action--ghost {
     background: @bg-header;
     color: @text-title;
diff --git a/miniprogram/pages/profile/profile.ts b/miniprogram/pages/profile/profile.ts
index 0fb2716..de94033 100644
--- a/miniprogram/pages/profile/profile.ts
+++ b/miniprogram/pages/profile/profile.ts
@@ -115,6 +115,11 @@ Page({
     },
 
     onOpenProfileEditor() {
+        console.log(
+            'onOpenProfileEditor',
+            this.data.userName,
+            this.data.avatarUrl,
+        );
         this.setData({
             showProfileEditor: true,
             draftNickName:
diff --git a/miniprogram/pages/profile/profile.wxml b/miniprogram/pages/profile/profile.wxml
index d1ebace..c65f89f 100644
--- a/miniprogram/pages/profile/profile.wxml
+++ b/miniprogram/pages/profile/profile.wxml
@@ -225,16 +225,19 @@
             </view>
 
             <view class="profile-editor__actions">
-                <view
+                <button
                     class="profile-editor__action profile-editor__action--ghost"
+                    disabled="{{isSavingProfile}}"
                     bindtap="onCloseProfileEditor">
                     取消
-                </view>
-                <view
+                </button>
+                <button
                     class="profile-editor__action profile-editor__action--primary {{isSavingProfile ? 'profile-editor__action--disabled' : ''}}"
+                    loading="{{isSavingProfile}}"
+                    disabled="{{isSavingProfile}}"
                     bindtap="onSubmitProfile">
                     {{isSavingProfile ? '保存中...' : '保存'}}
-                </view>
+                </button>
             </view>
         </view>
     </van-popup>
diff --git a/miniprogram/services/api-activity.ts b/miniprogram/services/api-activity.ts
new file mode 100644
index 0000000..0e19a85
--- /dev/null
+++ b/miniprogram/services/api-activity.ts
@@ -0,0 +1,13 @@
+let pendingWrites = 0;
+
+/** 覆盖登录等待、上传及重试全过程，防止写操作进行中切换服务端。 */
+export function beginApiWrite() {
+    pendingWrites++;
+    return () => {
+        pendingWrites--;
+    };
+}
+
+export function hasPendingApiWrites() {
+    return pendingWrites > 0;
+}
diff --git a/miniprogram/services/api-request.ts b/miniprogram/services/api-request.ts
index 65619fc..92d8129 100644
--- a/miniprogram/services/api-request.ts
+++ b/miniprogram/services/api-request.ts
@@ -1,4 +1,5 @@
 import { getApiConfig } from '../config/api';
+import { beginApiWrite } from './api-activity';
 import {
     ApiRequestError,
     requestApi,
@@ -30,6 +31,21 @@ const blocked = new Set([
 export async function apiRequest<T>(
     path: string,
     options: RequestOptions & { auth?: 'required' | 'none' } = {},
+): Promise<T> {
+    const finish =
+        options.upload || (options.method && options.method !== 'GET')
+            ? beginApiWrite()
+            : undefined;
+    try {
+        return await performApiRequest<T>(path, options);
+    } finally {
+        finish?.();
+    }
+}
+
+async function performApiRequest<T>(
+    path: string,
+    options: RequestOptions & { auth?: 'required' | 'none' } = {},
 ): Promise<T> {
     // Authorization 由会话层统一提供；公开请求不附带调用方误传的凭证。
     const header = Object.fromEntries(
diff --git a/miniprogram/services/api-transport.ts b/miniprogram/services/api-transport.ts
index 05b5f7b..2ad9608 100644
--- a/miniprogram/services/api-transport.ts
+++ b/miniprogram/services/api-transport.ts
@@ -1,4 +1,4 @@
-import { getApiConfig } from '../config/api';
+import { getApiConfig, isCurrentApiConfig } from '../config/api';
 
 export class ApiRequestError extends Error {
     constructor(
@@ -28,7 +28,15 @@ export function requestApi<T>(
     if (!path.startsWith('/') || path.startsWith('//'))
         throw new Error('接口路径不正确');
     return new Promise((resolve, reject) => {
+        // 公开请求、上传和登录共用检查，旧环境的响应不进入上层业务回调。
+        const stale = () => {
+            if (isCurrentApiConfig(config)) return false;
+            reject(new ApiRequestError('接口环境已变化，请重新操作'));
+            return true;
+        };
+        if (stale()) return;
         const success = (res: { statusCode: number; data: unknown }) => {
+            if (stale()) return;
             const body = res.data as {
                 code?: number;
                 data?: T;
@@ -42,7 +50,7 @@ export function requestApi<T>(
                             : '接口请求失败，请稍后重试',
                         res.statusCode,
                         typeof body?.reason === 'string' &&
-                            /^[A-Z_]{1,64}$/.test(body.reason)
+                        /^[A-Z_]{1,64}$/.test(body.reason)
                             ? body.reason
                             : '',
                     ),
@@ -60,8 +68,12 @@ export function requestApi<T>(
                 );
             } else resolve(body.data as T);
         };
-        const fail = () =>
-            reject(new ApiRequestError('连接失败，请确认后端已启动及网络配置'));
+        const fail = () => {
+            if (!stale())
+                reject(
+                    new ApiRequestError('连接失败，请确认后端已启动及网络配置'),
+                );
+        };
         if (options.upload) {
             // wx.uploadFile 由运行时生成 multipart boundary，不能自行设置 JSON Content-Type。
             wx.uploadFile({
diff --git a/miniprogram/services/auth-session.ts b/miniprogram/services/auth-session.ts
index 21d5af8..f52bb1a 100644
--- a/miniprogram/services/auth-session.ts
+++ b/miniprogram/services/auth-session.ts
@@ -1,4 +1,4 @@
-import { getApiConfig } from '../config/api';
+import { getApiConfig, apiContextKey, isCurrentApiConfig } from '../config/api';
 import { ApiRequestError, requestApi } from './api-transport';
 
 export interface ServerUser {
@@ -32,7 +32,7 @@ export function getAuthContext() {
     if (!appId) throw new ApiRequestError('无法识别小程序身份');
     return {
         ...config,
-        key: `doodle_auth_v1:${encodeURIComponent(appId)}:${encodeURIComponent(config.baseUrl)}`,
+        key: `doodle_auth_v2:${apiContextKey(config)}`,
     };
 }
 
@@ -70,7 +70,18 @@ function readState(context: Context): SessionState {
         generation: 0,
     };
     try {
-        const stored = wx.getStorageSync(context.key);
+        // 旧版会话只迁入原默认环境，不能复制到同址的 staging/production 开发配置。
+        const legacyDefault =
+            context.version === 'develop'
+                ? context.environment === 'local'
+                : context.environment === 'production';
+        const stored =
+            wx.getStorageSync(context.key) ||
+            (legacyDefault
+                ? wx.getStorageSync(
+                      `doodle_auth_v1:${encodeURIComponent(wx.getAccountInfoSync().miniProgram.appId)}:${encodeURIComponent(context.baseUrl)}`,
+                  )
+                : null);
         if (stored) {
             state.history = 'used';
             if (
@@ -145,7 +156,7 @@ export async function ensureSession(
     force = false,
     explicitStart = false,
 ): Promise<AuthSession> {
-    if (getAuthContext().key !== context.key)
+    if (!isCurrentApiConfig(context))
         throw new ApiRequestError('接口环境已变化，请重新操作');
     const state = readState(context);
     if (state.history === 'blocked' && !explicitStart)
@@ -184,11 +195,13 @@ export async function ensureSession(
                     );
                     break;
                 } catch (error) {
-                    if (!(
-                        error instanceof ApiRequestError &&
-                        error.reason === 'WECHAT_CODE_INVALID' &&
-                        attempt === 0
-                    ))
+                    if (
+                        !(
+                            error instanceof ApiRequestError &&
+                            error.reason === 'WECHAT_CODE_INVALID' &&
+                            attempt === 0
+                        )
+                    )
                         throw error;
                 }
             }
@@ -210,10 +223,7 @@ export async function ensureSession(
                 user: parseServerUser(result.user),
             };
             // 清理、切换环境期间迟到的登录响应不得恢复会话或写入当前界面。
-            if (
-                state.generation !== generation ||
-                getAuthContext().key !== context.key
-            )
+            if (state.generation !== generation || !isCurrentApiConfig(context))
                 throw new ApiRequestError('登录状态已变化，请重新操作');
             state.session = session;
             state.history = 'used';
@@ -222,6 +232,7 @@ export async function ensureSession(
         } catch (error) {
             if (
                 state.generation === generation &&
+                isCurrentApiConfig(context) &&
                 error instanceof ApiRequestError &&
                 [
                     'ACCOUNT_NOT_FOUND',
@@ -244,6 +255,14 @@ export async function ensureSession(
     }
 }
 
+/** 保留各环境已保存会话和账户历史，只作废尚未完成的登录任务。 */
+export function invalidatePendingAuthentication() {
+    for (const state of states.values()) {
+        state.generation++;
+        state.flight = undefined;
+    }
+}
+
 /** 同一原请求只恢复一次；迟到的旧 401 直接复用较新凭证。 */
 export async function recoverSession(context: Context, failed: AuthSession) {
     const state = readState(context);
diff --git a/miniprogram/services/environment-switch.ts b/miniprogram/services/environment-switch.ts
new file mode 100644
index 0000000..491475b
--- /dev/null
+++ b/miniprogram/services/environment-switch.ts
@@ -0,0 +1,46 @@
+import {
+    getApiEnvironment,
+    selectApiEnvironment,
+    type ApiEnvironment,
+} from '../config/api';
+import { hasPendingApiWrites } from './api-activity';
+import { invalidatePendingAuthentication } from './auth-session';
+
+let switching = false;
+
+/** 统一切换入口：写入中不切换，保留分环境会话，重建全部页面以丢弃旧业务状态。 */
+export async function switchApiEnvironment(environment: ApiEnvironment) {
+    if (wx.getAccountInfoSync().miniProgram.envVersion !== 'develop')
+        throw new Error('仅开发版可切换环境');
+    if (switching) throw new Error('正在切换环境，请稍候');
+    if (getApiEnvironment() === environment) return false;
+    const busyPage = getCurrentPages().some(
+        (page) => page.data.debugPublishLoading || page.data.isSavingProfile,
+    );
+    if (hasPendingApiWrites() || busyPage)
+        throw new Error('请等待当前保存或上传完成后再切换');
+    switching = true;
+    try {
+        selectApiEnvironment(environment);
+        invalidatePendingAuthentication();
+        const app = getApp<IAppOption>();
+        app.resetApiState();
+        // reLaunch 只重建页面，不重新执行 App.onLaunch；目标数据需要主动初始化。
+        try {
+            await new Promise<void>((resolve, reject) =>
+                wx.reLaunch({
+                    url: '/pages/home/home',
+                    success: () => resolve(),
+                    fail: () => reject(new Error('环境已切换，请重新进入首页')),
+                }),
+            );
+        } finally {
+            app.warmAuthentication();
+            if (!(await app.loadPageConfig(true)))
+                throw new Error('已切换，目标接口连接失败');
+        }
+        return true;
+    } finally {
+        switching = false;
+    }
+}
diff --git a/miniprogram/supportPages/debug/debug.less b/miniprogram/supportPages/debug/debug.less
index 804440b..0cf11e5 100644
--- a/miniprogram/supportPages/debug/debug.less
+++ b/miniprogram/supportPages/debug/debug.less
@@ -12,28 +12,6 @@ page {
     box-sizing: border-box;
 }
 
-.debug-page__hero {
-    padding: 48rpx 40rpx;
-    background: @bg-white;
-    border-radius: @radius-xl;
-    box-shadow: @shadow;
-}
-
-.debug-page__hero-title {
-    display: block;
-    font-size: 40rpx;
-    font-weight: 800;
-    color: @text-title;
-}
-
-.debug-page__hero-desc {
-    display: block;
-    margin-top: 16rpx;
-    font-size: 26rpx;
-    line-height: 1.6;
-    color: @text-secondary;
-}
-
 .debug-page__section {
     margin-top: 32rpx;
 }
@@ -125,3 +103,65 @@ page {
     font-size: 24rpx;
     line-height: 1.6;
 }
+
+.debug-page__environment {
+    padding: 32rpx;
+    background: @bg-white;
+    border-radius: @radius-xl;
+    box-shadow: @shadow;
+}
+
+.debug-page__environment-url {
+    display: block;
+    word-break: break-all;
+    color: @text-secondary;
+    font-size: 24rpx;
+}
+
+.debug-page__environment-options {
+    display: flex;
+    flex-direction: column;
+    margin-top: 24rpx;
+}
+
+/* 明确按钮高度及整行点击区域，避免原生 button 被全局样式压缩。 */
+.debug-page__environment-options .debug-environment-option {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    width: 100%;
+    height: 96rpx;
+    flex-shrink: 0;
+    box-sizing: border-box;
+    margin: 0;
+    padding: 0 24rpx;
+    border: 0;
+    font-size: 28rpx;
+    line-height: 1.4;
+    color: @text-title;
+    background: @bg-header;
+    border-radius: 20rpx;
+}
+
+.debug-page__environment-options .debug-environment-option::after {
+    border: 0;
+}
+
+.debug-page__environment-options
+    .debug-environment-option
+    + .debug-environment-option {
+    margin-top: 16rpx;
+}
+
+.debug-page__environment-options .debug-environment-option--selected {
+    background: @brand;
+    font-weight: 700;
+}
+
+.debug-page__environment-note {
+    display: block;
+    margin-top: 20rpx;
+    color: @text-secondary;
+    font-size: 22rpx;
+    line-height: 1.6;
+}
diff --git a/miniprogram/supportPages/debug/debug.ts b/miniprogram/supportPages/debug/debug.ts
index 1cbfd40..29cdae5 100644
--- a/miniprogram/supportPages/debug/debug.ts
+++ b/miniprogram/supportPages/debug/debug.ts
@@ -1,3 +1,10 @@
+import {
+    getApiEnvironment,
+    getApiEnvironmentOptions,
+    isApiEnvironment,
+} from '../../config/api';
+import { switchApiEnvironment } from '../../services/environment-switch';
+
 type DebugEntry = {
     id: string;
     title: string;
@@ -47,7 +54,45 @@ const DEBUG_ENTRIES: DebugEntry[] = [
 Page({
     data: {
         entries: DEBUG_ENTRIES,
-        isDevEnv: true,
+        isDevEnv: false,
+        currentEnvironment: '',
+        currentBaseUrl: '',
+        environments: getApiEnvironmentOptions(),
+        isSwitchingEnvironment: false,
+    },
+
+    onShow() {
+        const environment = getApiEnvironment();
+        const environments = getApiEnvironmentOptions();
+        this.setData({
+            currentEnvironment: environment,
+            currentBaseUrl:
+                environments.find((item) => item.environment === environment)
+                    ?.baseUrl || '',
+            environments,
+        });
+    },
+
+    async onSelectEnvironment(e: WechatMiniprogram.TouchEvent) {
+        if (!this.data.isDevEnv || this.data.isSwitchingEnvironment) return;
+        const environment: unknown = e.currentTarget.dataset.environment;
+        if (!isApiEnvironment(environment)) return;
+        this.setData({ isSwitchingEnvironment: true });
+        wx.showLoading({ title: '切换环境中', mask: true });
+        let errorMessage = '';
+        try {
+            await switchApiEnvironment(environment);
+        } catch (error) {
+            errorMessage = error instanceof Error ? error.message : '切换失败';
+        } finally {
+            wx.hideLoading();
+            // 成功时本页已被 reLaunch 销毁，失败时才需要恢复按钮。
+            if (getCurrentPages().includes(this)) {
+                this.setData({ isSwitchingEnvironment: false });
+                this.onShow();
+            }
+        }
+        if (errorMessage) wx.showToast({ title: errorMessage, icon: 'none' });
     },
 
     onLoad() {
diff --git a/miniprogram/supportPages/debug/debug.wxml b/miniprogram/supportPages/debug/debug.wxml
index cd707b7..a3ce676 100644
--- a/miniprogram/supportPages/debug/debug.wxml
+++ b/miniprogram/supportPages/debug/debug.wxml
@@ -1,9 +1,24 @@
 <view class="debug-page">
-    <view class="debug-page__hero">
-        <text class="debug-page__hero-title">Debug 工具页</text>
-        <text class="debug-page__hero-desc">
-            仅开发环境可见，用于发布前检查和同步调试数据。
-        </text>
+    <view wx:if="{{isDevEnv}}" class="debug-page__environment">
+        <text class="debug-page__section-title"
+            >接口环境 · {{currentEnvironment}}</text
+        >
+        <text class="debug-page__environment-url">{{currentBaseUrl}}</text>
+        <view class="debug-page__environment-options">
+            <button
+                wx:for="{{environments}}"
+                wx:key="environment"
+                class="debug-environment-option {{currentEnvironment === item.environment ? 'debug-environment-option--selected' : ''}}"
+                data-environment="{{item.environment}}"
+                disabled="{{!item.available || isSwitchingEnvironment}}"
+                bindtap="onSelectEnvironment">
+                {{item.environment}}
+                <text wx:if="{{!item.available}}">（未配置）</text>
+            </button>
+        </view>
+        <text class="debug-page__environment-note"
+            >切换后自动返回首页；下次打开开发版继续使用所选环境。</text
+        >
     </view>
 
     <view class="debug-page__section">
diff --git a/tests/category-api.test.mjs b/tests/category-api.test.mjs
index d1072ef..a7f12bb 100644
--- a/tests/category-api.test.mjs
+++ b/tests/category-api.test.mjs
@@ -52,7 +52,7 @@ beforeEach(() => {
     requests = [];
     navigations = [];
     apiConfig.developmentEnvironment = 'local';
-    apiConfig.onlineBaseUrl = '';
+    apiConfig.productionBaseUrl = 'http://127.0.0.1:8800/api/v1';
     handler = () => ({ data: [] });
     globalThis.wx = {
         getAccountInfoSync: () => ({ miniProgram: { envVersion: 'develop' } }),
@@ -152,22 +152,23 @@ function useRows(rows, selectedCategories = categories) {
     };
 }
 
-test('环境配置：开发版默认本地，正式/体验/未知环境不回退本地，线上要求 HTTPS', () => {
-    assert.equal(
-        resolveApiConfig('develop').baseUrl,
-        'http://127.0.0.1:8800/api/v1',
-    );
-    for (const version of ['release', 'trial', 'unknown'])
-        assert.throws(() => resolveApiConfig(version), /线上/);
-    apiConfig.onlineBaseUrl = 'https://api.example.test/api/v1/';
-    for (const version of ['release', 'trial'])
+test('环境配置：体验/正式/未知包固定 production，暂允许指定的本机占位地址', () => {
+    assert.equal(resolveApiConfig('develop').environment, 'local');
+    for (const version of ['release', 'trial', 'unknown']) {
+        assert.equal(resolveApiConfig(version).environment, 'production');
         assert.equal(
             resolveApiConfig(version).baseUrl,
-            'https://api.example.test/api/v1',
+            'http://127.0.0.1:8800/api/v1',
         );
-    apiConfig.developmentEnvironment = 'online';
-    assert.equal(resolveApiConfig('develop').environment, 'online');
-    apiConfig.onlineBaseUrl = 'http://api.example.test/api/v1';
+    }
+    apiConfig.productionBaseUrl = '';
+    assert.throws(() => resolveApiConfig('release'), /production/);
+    apiConfig.productionBaseUrl = 'https://api.example.test/api/v1/';
+    assert.equal(
+        resolveApiConfig('release').baseUrl,
+        'https://api.example.test/api/v1',
+    );
+    apiConfig.productionBaseUrl = 'http://api.example.test/api/v1';
     assert.throws(() => resolveApiConfig('release'), /配置/);
 });
 
diff --git a/tests/environment-switch.test.mjs b/tests/environment-switch.test.mjs
new file mode 100644
index 0000000..af2a743
--- /dev/null
+++ b/tests/environment-switch.test.mjs
@@ -0,0 +1,425 @@
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import { dirname, resolve } from 'node:path';
+import vm from 'node:vm';
+import { test } from 'node:test';
+import ts from 'typescript';
+
+const deferred = () => {
+    let resolve;
+    const promise = new Promise((done) => {
+        resolve = done;
+    });
+    return { promise, resolve };
+};
+const tick = () => new Promise(setImmediate);
+
+/** 加载真实配置、请求、认证、App 与切换流程，仅模拟微信运行时和服务端响应。 */
+function fixture(storage = new Map()) {
+    let version = 'develop';
+    let app;
+    let pages = [];
+    let prefetchCalls = 0;
+    let navigationCount = 0;
+    let loginCount = 0;
+    let handler = ({ url, environment }) => {
+        if (url.endsWith('/auth/wechat/login')) {
+            return {
+                accessToken: `token-${environment}`,
+                tokenType: 'Bearer',
+                expiresIn: 86400,
+                expiresAt: '2099-01-01T00:00:00Z',
+                user: {
+                    id: `user-${environment}`,
+                    nickName: environment,
+                    avatarUrl: null,
+                    avatarUrlExpiresAt: null,
+                    createdAt: '2026-10-19T00:00:00Z',
+                },
+            };
+        }
+        return { home: { marker: environment } };
+    };
+    const requests = [];
+    const wx = {
+        getAccountInfoSync: () => ({
+            miniProgram: { appId: 'wx-env-test', envVersion: version },
+        }),
+        getStorageSync: (key) => storage.get(key),
+        setStorageSync: (key, value) =>
+            storage.set(key, structuredClone(value)),
+        removeStorageSync: (key) => storage.delete(key),
+        login({ success }) {
+            loginCount++;
+            success({ code: `code-${loginCount}` });
+        },
+        request(options) {
+            send(options);
+        },
+        uploadFile(options) {
+            send(options, true);
+        },
+        getBackgroundFetchData({ success }) {
+            prefetchCalls++;
+            success({
+                fetchedData: JSON.stringify({
+                    home: { marker: 'legacy-prefetch' },
+                }),
+            });
+        },
+        reLaunch({ url, success }) {
+            assert.equal(url, '/pages/home/home');
+            navigationCount++;
+            const page = {
+                route: 'pages/home/home',
+                data: {},
+                initData(config) {
+                    this.data.config = config;
+                },
+            };
+            pages = [page];
+            void app.getPageConfig().then((config) => page.initData(config));
+            success();
+        },
+    };
+    function send(options, upload = false) {
+        const request = {
+            ...options,
+            environment: load('config/api').getApiConfig().environment,
+        };
+        requests.push(request);
+        Promise.resolve()
+            .then(() => handler(request))
+            .then(
+                (data) => {
+                    const body = { code: 0, data };
+                    options.success({
+                        statusCode: 200,
+                        data: upload ? JSON.stringify(body) : body,
+                    });
+                },
+                () => options.fail({}),
+            );
+    }
+    const modules = new Map();
+    const context = vm.createContext({
+        wx,
+        console,
+        Error,
+        getApp: () => app,
+        getCurrentPages: () => pages,
+        App(value) {
+            app = value;
+        },
+    });
+    function load(file) {
+        file = resolve('miniprogram', file);
+        if (!file.endsWith('.ts')) file += '.ts';
+        if (modules.has(file)) return modules.get(file);
+        const exports = {};
+        modules.set(file, exports);
+        const code = ts.transpileModule(readFileSync(file, 'utf8'), {
+            compilerOptions: {
+                module: ts.ModuleKind.CommonJS,
+                target: ts.ScriptTarget.ES2020,
+            },
+        }).outputText;
+        vm.runInContext(`(function(require,exports){${code}\n})`, context)(
+            (name) => load(resolve(dirname(file), name)),
+            exports,
+        );
+        return exports;
+    }
+    load('app');
+    return {
+        config: load('config/api'),
+        auth: load('utils/auth'),
+        api: load('services/api-request'),
+        member: load('services/member-api'),
+        switcher: load('services/environment-switch'),
+        activity: load('services/api-activity'),
+        app,
+        wx,
+        storage,
+        requests,
+        handle(fn) {
+            handler = fn;
+        },
+        version(value) {
+            version = value;
+        },
+        pages(value) {
+            pages = value;
+        },
+        get currentPages() {
+            return pages;
+        },
+        get prefetchCalls() {
+            return prefetchCalls;
+        },
+        get navigationCount() {
+            return navigationCount;
+        },
+        get loginCount() {
+            return loginCount;
+        },
+    };
+}
+
+test('同址三环境仍隔离凭证与缓存；切换重建首页和个人状态，切回复用会话', async () => {
+    const f = fixture(
+        new Map([['pageConfig', { home: { marker: 'legacy-storage' } }]]),
+    );
+    await f.app.loadPageConfig();
+    await f.auth.getUser();
+    assert.equal(f.app.globalData.pageConfig.home.marker, 'local');
+    const localConfig = f.config.getApiConfig();
+    f.app.globalData.pendingCategoryTabId = 'math';
+    for (const target of ['staging', 'production', 'local']) {
+        await f.switcher.switchApiEnvironment(target);
+        await tick();
+        assert.equal(f.app.globalData.user.id, `user-${target}`);
+        assert.equal(f.app.globalData.pageConfig.home.marker, target);
+        assert.equal(f.currentPages[0].data.config.home.marker, target);
+        assert.equal(f.app.globalData.pendingCategoryTabId, undefined);
+    }
+    assert.equal(f.loginCount, 3);
+    assert.equal(f.navigationCount, 3);
+    assert.equal(f.prefetchCalls, 0);
+    assert.equal(f.config.isCurrentApiConfig(localConfig), false);
+    const cacheKeys = [...f.storage.keys()].filter((key) =>
+        key.startsWith('doodle_page_config_v2:'),
+    );
+    assert.equal(cacheKeys.length, 3);
+    const authKeys = [...f.storage.keys()].filter((key) =>
+        key.startsWith('doodle_auth_v2:'),
+    );
+    assert.equal(authKeys.length, 3);
+    const restored = fixture(f.storage);
+    assert.equal(restored.config.getApiConfig().environment, 'local');
+    f.config.selectApiEnvironment('staging');
+    assert.equal(
+        fixture(f.storage).config.getApiConfig().environment,
+        'staging',
+    );
+});
+
+test('trial/release/未知包固定 production，不能通过缓存或切换入口覆盖；保留原预拉取', async () => {
+    const f = fixture();
+    f.config.selectApiEnvironment('staging');
+    for (const version of ['trial', 'release', 'unknown']) {
+        f.version(version);
+        assert.equal(f.config.getApiConfig().environment, 'production');
+        await assert.rejects(
+            f.switcher.switchApiEnvironment('local'),
+            /仅开发版/,
+        );
+        assert.throws(() => f.config.selectApiEnvironment('local'), /仅开发版/);
+    }
+    f.version('trial');
+    await f.app.loadPageConfig();
+    assert.equal(f.prefetchCalls, 1);
+    assert.equal(f.app.globalData.pageConfig.home.marker, 'legacy-prefetch');
+});
+
+test('公开接口旧响应在 A→B→A 后仍作废；不会作为当前请求成功返回', async () => {
+    const f = fixture();
+    const gate = deferred();
+    f.handle(() => gate.promise);
+    const pending = f.api.apiRequest('/categories', { auth: 'none' });
+    const rejected = assert.rejects(pending, /环境已变化/);
+    await tick();
+    f.config.selectApiEnvironment('staging');
+    f.config.selectApiEnvironment('local');
+    gate.resolve([]);
+    await rejected;
+});
+
+test('写请求、上传及登录等待全过程禁止切换，完成后可切换', async () => {
+    const f = fixture();
+    await f.auth.getUser();
+    const gate = deferred();
+    f.handle(() => gate.promise);
+    const pending = f.member.uploadAsset('/tmp/test.jpg', 'preview');
+    await tick();
+    assert.equal(f.activity.hasPendingApiWrites(), true);
+    await assert.rejects(
+        f.switcher.switchApiEnvironment('staging'),
+        /等待当前保存或上传/,
+    );
+    assert.equal(f.config.getApiConfig().environment, 'local');
+    gate.resolve({
+        id: 'test-preview',
+        url: 'https://example.test/preview.jpg',
+    });
+    await pending;
+    assert.equal(f.activity.hasPendingApiWrites(), false);
+    f.pages([{ data: { debugPublishLoading: true } }]);
+    await assert.rejects(
+        f.switcher.switchApiEnvironment('staging'),
+        /等待当前保存或上传/,
+    );
+});
+
+test('未配置地址与缓存写入失败不改变当前环境；目标连接失败不回退、不展示旧内容', async () => {
+    const f = fixture();
+    f.config.apiConfig.stagingBaseUrl = '';
+    assert.equal(f.config.getApiEnvironmentOptions()[1].available, false);
+    await assert.rejects(
+        f.switcher.switchApiEnvironment('staging'),
+        /配置 staging/,
+    );
+    assert.equal(f.config.getApiConfig().environment, 'local');
+    f.config.apiConfig.stagingBaseUrl = f.config.apiConfig.localBaseUrl;
+    const original = f.wx.setStorageSync;
+    f.wx.setStorageSync = () => {
+        throw new Error('storage full');
+    };
+    await assert.rejects(
+        f.switcher.switchApiEnvironment('staging'),
+        /storage full/,
+    );
+    assert.equal(f.config.getApiConfig().environment, 'local');
+    f.wx.setStorageSync = original;
+    f.app.globalData.pageConfig = { home: { marker: 'local-old' } };
+    f.handle(() => {
+        throw new Error('offline');
+    });
+    await assert.rejects(
+        f.switcher.switchApiEnvironment('staging'),
+        /目标接口连接失败/,
+    );
+    assert.equal(f.config.getApiConfig().environment, 'staging');
+    assert.equal(f.app.globalData.pageConfig, undefined);
+    assert.equal(f.currentPages[0].data.config, null);
+});
+
+test('旧首页初始化与登录迟到响应不污染切换后的共享状态，旧等待者被释放', async () => {
+    const f = fixture();
+    const gate = deferred();
+    f.handle(({ environment, url }) => {
+        if (environment === 'local') return gate.promise;
+        if (url.endsWith('/page-config'))
+            return { home: { marker: 'staging' } };
+        throw new Error('skip login');
+    });
+    const waiter = f.app.getPageConfig();
+    const pendingConfig = f.app.loadPageConfig();
+    const pendingLogin = f.auth.getUser();
+    const rejected = assert.rejects(pendingLogin, /环境已变化|登录状态已变化/);
+    await tick();
+    await f.switcher.switchApiEnvironment('staging');
+    assert.equal(await waiter, null);
+    gate.resolve({ home: { marker: 'old-local' } });
+    await pendingConfig;
+    await rejected;
+    assert.equal(f.app.globalData.pageConfig.home.marker, 'staging');
+    assert.equal(f.app.globalData.user, null);
+});
+
+test('配置变更使当前地址失效时仍能切走；写请求等待首次登录期间也禁止切换', async () => {
+    const f = fixture();
+    f.config.selectApiEnvironment('staging');
+    f.config.apiConfig.stagingBaseUrl = '';
+    assert.throws(() => f.config.getApiConfig(), /配置 staging/);
+    const waiting = f.app.getPageConfig();
+    assert.equal(await f.app.loadPageConfig(), false);
+    assert.equal(await waiting, null);
+    await f.switcher.switchApiEnvironment('local');
+    assert.equal(f.config.getApiConfig().environment, 'local');
+    const g = fixture();
+    const gate = deferred();
+    g.handle(({ url }) =>
+        url.endsWith('/auth/wechat/login') ? gate.promise : {},
+    );
+    const write = g.api.apiRequest('/me/profile', {
+        method: 'PUT',
+        data: { nickName: 'test' },
+    });
+    await tick();
+    assert.equal(
+        g.requests.filter((row) => row.url.endsWith('/me/profile')).length,
+        0,
+    );
+    await assert.rejects(
+        g.switcher.switchApiEnvironment('staging'),
+        /等待当前保存或上传/,
+    );
+    gate.resolve({
+        accessToken: 'token-local',
+        tokenType: 'Bearer',
+        expiresIn: 86400,
+        expiresAt: '2099-01-01T00:00:00Z',
+        user: {
+            id: 'user-local',
+            nickName: null,
+            avatarUrl: null,
+            avatarUrlExpiresAt: null,
+            createdAt: '2026-10-19T00:00:00Z',
+        },
+    });
+    await write;
+    assert.equal(g.activity.hasPendingApiWrites(), false);
+});
+
+test('Debug 页面调用统一切换入口，失败时隐藏 loading 后显示错误；非开发包拒绝操作', async () => {
+    const f = fixture();
+    let definition;
+    let toasts = [];
+    let loading = false;
+    f.wx.showLoading = () => {
+        loading = true;
+    };
+    f.wx.hideLoading = () => {
+        loading = false;
+    };
+    f.wx.showToast = (options) => {
+        assert.equal(loading, false);
+        toasts.push(options.title);
+    };
+    const source = ts.transpileModule(
+        readFileSync('miniprogram/supportPages/debug/debug.ts', 'utf8'),
+        {
+            compilerOptions: {
+                module: ts.ModuleKind.CommonJS,
+                target: ts.ScriptTarget.ES2020,
+            },
+        },
+    ).outputText;
+    vm.runInNewContext(source, {
+        exports: {},
+        wx: f.wx,
+        Error,
+        getCurrentPages: () => [definition],
+        require(name) {
+            return name === '../../config/api' ? f.config : f.switcher;
+        },
+        Page(value) {
+            definition = {
+                ...value,
+                setData(value) {
+                    Object.assign(this.data, value);
+                },
+            };
+        },
+    });
+    definition.onLoad();
+    definition.onShow();
+    assert.equal(definition.data.currentEnvironment, 'local');
+    f.config.apiConfig.stagingBaseUrl = '';
+    await definition.onSelectEnvironment({
+        currentTarget: { dataset: { environment: 'staging' } },
+    });
+    assert.match(toasts.at(-1), /配置 staging/);
+    assert.equal(definition.data.isSwitchingEnvironment, false);
+    f.version('trial');
+    definition.onLoad();
+    definition.onShow();
+    assert.equal(definition.data.isDevEnv, false);
+    assert.equal(definition.data.currentEnvironment, 'production');
+    toasts = [];
+    await definition.onSelectEnvironment({
+        currentTarget: { dataset: { environment: 'local' } },
+    });
+    assert.equal(toasts.length, 0);
+});
diff --git a/tests/preview-assets.test.mjs b/tests/preview-assets.test.mjs
index e167e0a..3b97ff3 100644
--- a/tests/preview-assets.test.mjs
+++ b/tests/preview-assets.test.mjs
@@ -95,6 +95,12 @@ test('首页配置：预拉取、旧 storage 缓存及新后端兜底均写回
             require(name) {
                 if (name === './services/site-api')
                     return { fetchPageConfig: async () => old };
+                if (name === './config/api')
+                    return {
+                        getApiConfig: () => ({ version: 'release' }),
+                        apiContextKey: () => 'test-production',
+                        isCurrentApiConfig: () => true,
+                    };
                 if (name === './config/assets')
                     return { normalizePreviewImages };
                 return {};
@@ -112,7 +118,7 @@ test('首页配置：预拉取、旧 storage 缓存及新后端兜底均写回
                     return entry === 'storage' ? old : null;
                 },
                 setStorageSync(key, value) {
-                    assert.equal(key, 'pageConfig');
+                    assert.equal(key, 'doodle_page_config_v2:test-production');
                     stored = value;
                 },
             },
diff --git a/typings/index.d.ts b/typings/index.d.ts
index 615b16a..93d9d2d 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -31,5 +31,10 @@ interface IAppOption {
     };
     userInfoReadyCallback?: WechatMiniprogram.GetUserInfoSuccessCallback;
     getPageConfig(): Promise<PageConfigData | null>;
+    /** 切换接口环境时主动重置、初始化 App；页面重建不重新运行 onLaunch。 */
+    resetApiState(): void;
+    warmAuthentication(): void;
+    loadPageConfig(forceRefresh?: boolean): Promise<boolean>;
+    refreshPageConfig(): Promise<void>;
     [key: string]: any;
 }