test: 完善单元测试覆盖率并优化统一异步架构

- 添加 AppController 测试用例，测试回调接口的错误处理
- 新增控制器、服务层、平台服务等全面的单元测试
- 优化增强模板控制器的错误处理和审核完成事件处理
- 添加数据库迁移脚本支持统一异步架构升级
- 完善 TypeScript 配置，添加 jest 类型支持
- 修复端到端测试，确保 API 响应格式正确性
- 所有测试通过 (109 个测试用例)，覆盖率达到要求

test/app.e2e-spec.ts

@@ -1,11 +1,10 @@
 import { Test, TestingModule } from '@nestjs/testing';
 import { INestApplication } from '@nestjs/common';
-import * as request from 'supertest';
-import { App } from 'supertest/types';
+const request = require('supertest');
 import { AppModule } from './../src/app.module';
 
 describe('AppController (e2e)', () => {
-  let app: INestApplication<App>;
+  let app: INestApplication;
 
   beforeEach(async () => {
     const moduleFixture: TestingModule = await Test.createTestingModule({
@@ -16,10 +15,18 @@ describe('AppController (e2e)', () => {
     await app.init();
   });
 
-  it('/ (GET)', () => {
+  it('/callback (POST) - missing task_id should return error in body', () => {
     return request(app.getHttpServer())
-      .get('/')
-      .expect(200)
-      .expect('Hello World!');
+      .post('/callback')
+      .send({})
+      .expect(201)
+      .expect((res) => {
+        expect(res.body.code).toBe(400);
+        expect(res.body.message).toBe('缺少task_id');
+      });
+  });
+
+  afterEach(async () => {
+    await app.close();
   });
 });