Fix Vite HMR WebSocket Connection Issue

- Disabled HMR in production environment to prevent WebSocket conflicts
- HMR not needed in reverse proxy setup with systemd service
- Eliminates 'failed to connect to websocket' errors in browser console
- Cleaner production deployment without development-specific features

frontend/vite.config.ts

@@ -11,6 +11,7 @@ export default defineConfig({
       '192.168.0.12',
       'localhost'
     ],
+    hmr: false, // HMR in Production-Umgebung deaktivieren
     proxy: {
       '/api': {
         target: 'http://192.168.0.12:8000',