Fix server management issues and improve overall stability

Major server management fixes:
- Replace Flatpak-specific pkill with universal process tree termination using pstree + process.kill()
- Fix signal format errors (SIGTERM/SIGKILL instead of TERM/KILL strings)
- Add 5-second cooldown after server stop to prevent race conditions with external detection
- Enable Stop Server button for external servers in UI
- Implement proper timeout handling with process tree killing

ContentDB improvements:
- Fix download retry logic and "closed" error by preventing concurrent zip extraction
- Implement smart root directory detection and stripping during package extraction
- Add game-specific timeout handling (8s for VoxeLibre vs 3s for simple games)

World creation fixes:
- Make world creation asynchronous to prevent browser hangs
- Add WebSocket notifications for world creation completion status

Other improvements:
- Remove excessive debug logging
- Improve error handling and user feedback throughout the application
- Clean up temporary files and unnecessary logging

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

routes/config.js

@@ -4,6 +4,7 @@ const fs = require('fs').promises;
 const paths = require('../utils/paths');
 const ConfigParser = require('../utils/config-parser');
 const appConfig = require('../utils/app-config');
+const PackageRegistry = require('../utils/package-registry');
 
 const router = express.Router();
 
@@ -170,8 +171,11 @@ router.post('/update', async (req, res) => {
       if (newDataDir && newDataDir !== appConfig.getDataDirectory()) {
         try {
           await appConfig.setDataDirectory(newDataDir);
-          // Update paths to use new directory
-          await paths.initialize();
+          // Force reload paths to use new directory
+          await paths.forceReload();
+          // Reinitialize package registry to use new directory
+          const packageRegistry = new PackageRegistry();
+          await packageRegistry.reinitialize();
         } catch (error) {
           throw new Error(`Failed to update data directory: ${error.message}`);
         }
@@ -286,6 +290,53 @@ router.get('/api/schema', (req, res) => {
 });
 
 // Get current configuration (API)
+// Change data directory only
+router.post('/change-data-directory', async (req, res) => {
+  try {
+    const { newDataDirectory } = req.body;
+    
+    if (!newDataDirectory || !newDataDirectory.trim()) {
+      return res.status(400).json({ 
+        success: false, 
+        error: 'Data directory path is required' 
+      });
+    }
+    
+    const newDataDir = newDataDirectory.trim();
+    const currentDataDir = appConfig.getDataDirectory();
+    
+    if (newDataDir === currentDataDir) {
+      return res.json({ 
+        success: true, 
+        message: 'Data directory is already set to this path',
+        dataDirectory: currentDataDir 
+      });
+    }
+    
+    // Validate and set new data directory
+    await appConfig.load();
+    await appConfig.setDataDirectory(newDataDir);
+    await appConfig.save();
+    
+    // Update paths to use new directory
+    await paths.initialize();
+    
+    res.json({ 
+      success: true, 
+      message: 'Data directory updated successfully. Please restart the application for all changes to take effect.',
+      dataDirectory: newDataDir,
+      previousDirectory: currentDataDir
+    });
+    
+  } catch (error) {
+    console.error('Error changing data directory:', error);
+    res.status(500).json({ 
+      success: false, 
+      error: `Failed to change data directory: ${error.message}` 
+    });
+  }
+});
+
 router.get('/api/current', async (req, res) => {
   try {
     const config = await ConfigParser.parseConfig(paths.configFile);