Fix: Update CORS and network config for dev IP access

backend/src/index.ts

@@ -31,9 +31,11 @@ const io = new Server(httpServer, {
 });
 
 // Security middleware
-app.use(helmet());
+app.use(helmet({
+  crossOriginResourcePolicy: { policy: "cross-origin" }
+}));
 app.use(cors({
-  origin: process.env.FRONTEND_URL || 'http://localhost:3000',
+  origin: true, // Allow all origins in dev to fix the IP issue
   credentials: true
 }));