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/api.js

@@ -69,16 +69,6 @@ router.get('/server/status', async (req, res) => {
     }
     
     const isExternal = serverManager.serverProcess?.external || false;
-    console.log('API: serverManager.serverProcess =', serverManager.serverProcess);
-    console.log('API: isExternal =', isExternal);
-    
-    console.log('API endpoint returning status:', {
-      isRunning: status.isRunning,
-      players: playerList.length, // Use the actual detected player count
-      playerNames: playerList.map(p => p.name),
-      statusText: status.isRunning ? 'running' : 'stopped',
-      isExternal: isExternal
-    });
     
     res.json({
       ...status,
@@ -531,4 +521,4 @@ module.exports = {
   setSocketIO,
   serverManager,
   configManager
-};
+};