add version.txt v0.3.0, /api/version reads from file

src/index.ts

@@ -64,7 +64,13 @@ 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({ version: 'd823421' });
+  const fs = require('fs');
+  const path = require('path');
+  let ver = 'unknown';
+  try {
+    ver = fs.readFileSync(path.join(__dirname, '..', 'version.txt'), 'utf8').trim();
+  } catch {}
+  res.json({ version: ver });
 });
 
 app.use('/api', authRoutes);

version.txt

@@ -0,0 +1 @@
+v0.3.0