feat: 完成分类、worksheet 接口开发，资源迁移到七牛

apps/server/src/common/api-exception.ts

@@ -0,0 +1,13 @@
+import { HttpException } from '@nestjs/common';
+import type { ApiErrorReason } from '@doodle/contracts';
+
+/** 仅由可信业务创建，过滤器只输出已登记原因，不透传第三方异常原文。 */
+export class ApiException extends HttpException {
+    constructor(
+        status: number,
+        readonly reason: ApiErrorReason,
+        readonly retryAfterSeconds?: number,
+    ) {
+        super({ reason }, status);
+    }
+}