fix: 修正 NestJS 构建产物路径为 dist/src

- 修复模块加载路径：dist/app.module -> dist/src/app.module
- 添加 Vercel 构建命令配置
- 确保 dist 目录在部署时被正确构建和包含

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

api/index.ts

@@ -15,8 +15,8 @@ async function bootstrap() {
 
     // 动态解析 dist 目录路径
     // 在 Vercel 环境中，__dirname 是 /var/task/api
-    // dist 目录在 /var/task/dist
-    const distPath = path.resolve(__dirname, '..', 'dist', 'app.module');
+    // NestJS 构建后文件在 dist/src 目录下
+    const distPath = path.resolve(__dirname, '..', 'dist', 'src', 'app.module');
     console.log('Loading AppModule from:', distPath);
 
     const { AppModule } = require(distPath);
@@ -48,6 +48,7 @@ async function bootstrap() {
         __dirname,
         '..',
         'dist',
+        'src',
         'common',
         'filters',
         'http-exception.filter',
@@ -56,6 +57,7 @@ async function bootstrap() {
         __dirname,
         '..',
         'dist',
+        'src',
         'common',
         'interceptors',
         'transform.interceptor',

vercel.json

@@ -1,5 +1,7 @@
 {
   "version": 2,
+  "buildCommand": "pnpm install && pnpm run build",
+  "installCommand": "pnpm install",
   "builds": [
     {
       "src": "api/index.ts",