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backend/server.js

@@ -10,7 +10,7 @@ const PORT = process.env.PORT || 3000;
 
 // Middleware
 app.use(cors({
-  origin: ['http://localhost:5173', 'http://frontend:5173'],
+  origin: ['http://localhost:5173', 'http://frontend:5173', 'http://0.0.0.0:5173'],
   credentials: true
 }));
 app.use(express.json());