Disable Vite HMR for Production Environment

- Completely disable Hot Module Replacement in production
- HMR incompatible with reverse proxy setup
- Eliminates WebSocket connection errors in browser
- Cleaner production deployment without dev features
- No more 'failed to connect to websocket' messages

frontend/vite.config.ts

@@ -1,6 +1,9 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
 
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
 export default defineConfig({
   plugins: [react()],
   server: {
@@ -11,7 +14,8 @@ export default defineConfig({
       '192.168.0.12',
       'localhost'
     ],
-    hmr: false, // HMR in Production-Umgebung deaktivieren
+    // HMR komplett deaktivieren - nicht kompatibel mit Reverse Proxy
+    hmr: false,
     proxy: {
       '/api': {
         target: 'http://192.168.0.12:8000',