feat: connect full Express app to Vercel for production auth

backend/api/index.ts

@@ -1,35 +1,3 @@
-export default async function handler(req: any, res: any) {
-  // Health check
-  if (req.url === '/api/health') {
-    return res.status(200).json({
-      status: 'OK',
-      timestamp: new Date().toISOString(),
-      environment: 'production',
-      database: 'configured'
-    });
-  }
+import app from '../src/app';
 
-  // Database test endpoint
-  if (req.url === '/api/db-test') {
-    try {
-      return res.json({
-        database_configured: true,
-        database_url_exists: true,
-        environment: 'production'
-      });
-    } catch (error: any) {
-      return res.status(500).json({
-        error: 'Database test failed',
-        message: error?.message || 'Unknown error'
-      });
-    }
-  }
-
-  // Default API response
-  return res.json({ 
-    message: 'API is working',
-    method: req.method,
-    url: req.url,
-    endpoints: ['/api/health', '/api/db-test']
-  });
-}
+export default app;