feat: 下载次数限制，免费额度用完后第一次需要分享，之后需要看广告

miniprogram/base/pageMixin.ts

@@ -1,5 +1,9 @@
 import { PAPER_SIZE } from '../constants/colors';
-import { downloadPrint } from '../utils/downloadPrint';
+import { downloadPrint, tryUnlockWithRewardedAd } from '../utils/downloadPrint';
+import {
+    shouldShowShareGuide,
+    shouldUnlockWithAd,
+} from '../utils/shareGuide';
 import { BaseDrawService } from '../core/draw/baseDraw';
 import tracker from '../utils/tracker';
 import { defaultShareConfig } from '../config/config';
@@ -230,12 +234,28 @@ export function getPageCommonMethods(config: PageCommonMethodsConfig = {}) {
                 typeof this.getWorksheetStatsId === 'function'
                     ? this.getWorksheetStatsId()
                     : this.data.functionId;
-            await downloadPrint(this.canvas, {
+            const downloadOptions = {
                 errorToast: '请先生成内容',
                 trackerName: this.data.pageTitle,
                 trackerMode: this.data.currentMode,
                 worksheetId,
-            });
+            };
+
+            // 第 2 次及以后满批：直接拉激励广告
+            if (shouldUnlockWithAd()) {
+                const unlocked = await tryUnlockWithRewardedAd();
+                if (!unlocked) {
+                    return;
+                }
+            }
+
+            // 当日首次满批：仅分享解锁，弹窗引导
+            if (shouldShowShareGuide()) {
+                this.setData({ showShareDialog: true });
+                return;
+            }
+
+            await downloadPrint(this.canvas, downloadOptions);
         },
 
         getShareOptions(this: PageCanvasInstance): ShareOptions {
@@ -288,7 +308,6 @@ export function getPageCommonMethods(config: PageCommonMethodsConfig = {}) {
                     typeof this.getWorksheetStatsId === 'function'
                         ? this.getWorksheetStatsId()
                         : this.data.functionId;
-                // 分享成功后下载（不限制次数）
                 await downloadPrint(this.canvas, {
                     errorToast: '请先生成内容',
                     trackerName: this.data.pageTitle,