simplify /api/version to single field

src/index.ts

@@ -64,15 +64,7 @@ app.get('/api/activity/ping', (req, res) => {
 
 // 版本/健康检查 (用于验证部署)
 app.get('/api/version', (req, res) => {
-  res.json({
-    success: true,
-    name: 'maqt-backend',
-    version: '1.1.0',
-    buildTime: new Date().toISOString(),
-    commit: 'e249aa5',
-    env: process.env.NODE_ENV || 'development',
-    uptime: process.uptime(),
-  });
+  res.json({ version: 'd823421' });
 });
 
 app.use('/api', authRoutes);