feat: add version info endpoint and display in UI

server.js

@@ -499,6 +499,17 @@ app.get('/api/settings', (req, res) => {
   }
 });
 
+// Get version/commit info
+app.get('/api/version', (req, res) => {
+  const commitHash = process.env.COMMIT_HASH || 'dev';
+  const buildDate = process.env.BUILD_DATE || new Date().toISOString();
+  
+  res.json({
+    commit: commitHash,
+    buildDate: buildDate
+  });
+});
+
 // Start server
 app.listen(PORT, () => {
   console.log(`Server is running on http://localhost:${PORT}`);