feat: implement install mode detection and update commands in version upgrade process

server/index.js

@@ -9,6 +9,8 @@ import { dirname } from 'path';
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
 
+const installMode = fs.existsSync(path.join(__dirname, '..', '.git')) ? 'git' : 'npm';
+
 // ANSI color codes for terminal output
 const colors = {
     reset: '\x1b[0m',
@@ -333,7 +335,8 @@ app.use(express.urlencoded({ limit: '50mb', extended: true }));
 app.get('/health', (req, res) => {
   res.json({
     status: 'ok',
-    timestamp: new Date().toISOString()
+    timestamp: new Date().toISOString(),
+    installMode
   });
 });
 
@@ -410,11 +413,13 @@ app.post('/api/system/update', authenticateToken, async (req, res) => {
 
         console.log('Starting system update from directory:', projectRoot);
 
-        // Run the update command
-        const updateCommand = 'git checkout main && git pull && npm install';
+        // Run the update command based on install mode
+        const updateCommand = installMode === 'git'
+            ? 'git checkout main && git pull && npm install'
+            : 'npm install -g @siteboon/claude-code-ui@latest';
 
         const child = spawn('sh', ['-c', updateCommand], {
-            cwd: projectRoot,
+            cwd: installMode === 'git' ? projectRoot : os.homedir(),
             env: process.env
         });