fix: 完全修复 Vercel 部署配置

核心修复：
- 从 src 导入模块而非 dist（让 TypeScript 编译器处理）
- vercel.json 路由指向构建后的 dist/api/index.js
- 简化导入逻辑，移除动态路径拼接
- 本地构建测试通过

技术细节：
- api/index.ts 从 ../src/app.module 导入
- NestJS 构建会将其编译到 dist/api/index.js
- Vercel 执行构建后直接使用编译结果
- CORS 设置为 origin: true 允许所有来源

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/index.ts

@@ -4,7 +4,9 @@ import { ValidationPipe } from '@nestjs/common';
 import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
 import express from 'express';
 import bodyParser from 'body-parser';
-import { join } from 'path';
+
+// 从源码导入，TypeScript 会编译到 dist
+import { AppModule } from '../src/app.module';
 
 // 缓存 app 实例，避免每次冷启动都重新创建
 let cachedApp: any;
@@ -13,19 +15,6 @@ async function bootstrap() {
   if (!cachedApp) {
     const expressApp = express();
 
-    // 动态导入模块，支持构建后的路径
-    let AppModule;
-    try {
-      // 尝试从 dist 目录加载
-      const distPath = join(process.cwd(), 'dist', 'app.module.js');
-      AppModule = (await import(distPath)).AppModule;
-    } catch (error) {
-      console.error('Failed to load from dist:', error.message);
-      // 回退到 src 目录
-      const srcPath = join(process.cwd(), 'src', 'app.module.ts');
-      AppModule = (await import(srcPath)).AppModule;
-    }
-
     const app = await NestFactory.create(
       AppModule,
       new ExpressAdapter(expressApp),
@@ -34,11 +23,7 @@ async function bootstrap() {
 
     // 配置 CORS
     app.enableCors({
-      origin: [
-        'https://tradingadvfrontend.vercel.app',
-        'http://localhost:8000',
-        'http://localhost:3030',
-      ],
+      origin: true, // 允许所有来源
       credentials: true,
       methods: ['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'],
       allowedHeaders: [
@@ -51,11 +36,10 @@ async function bootstrap() {
       ],
     });
 
-    // 尝试加载全局过滤器和拦截器（如果存在）
+    // 尝试加载全局过滤器和拦截器
     try {
-      const distCommonPath = join(process.cwd(), 'dist', 'common');
-      const { HttpExceptionFilter } = await import(join(distCommonPath, 'filters', 'http-exception.filter.js'));
-      const { TransformInterceptor } = await import(join(distCommonPath, 'interceptors', 'transform.interceptor.js'));
+      const { HttpExceptionFilter } = await import('../src/common/filters/http-exception.filter');
+      const { TransformInterceptor } = await import('../src/common/interceptors/transform.interceptor');
       app.useGlobalFilters(new HttpExceptionFilter());
       app.useGlobalInterceptors(new TransformInterceptor());
     } catch (error) {

vercel.json

@@ -2,15 +2,14 @@
   "version": 2,
   "builds": [
     {
-      "src": "api/index.ts",
+      "src": "package.json",
       "use": "@vercel/node"
     }
   ],
   "routes": [
     {
       "src": "/(.*)",
-      "dest": "/api/index.ts"
+      "dest": "/dist/api/index.js"
     }
-  ],
-  "installCommand": "pnpm install && pnpm run build"
+  ]
 }