Update WebSocket configuration and clean up docker-compose

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   # Redis para cache de artículos
   redis:

web/backend/server.js

@@ -16,7 +16,7 @@ const PROJECT_ROOT = process.env.PROJECT_ROOT || join(__dirname, '../..');
 
 const app = express();
 const server = createServer(app);
-const wss = new WebSocketServer({ server });
+const wss = new WebSocketServer({ server, path: '/ws' });
 
 app.use(cors());
 app.use(express.json());

web/frontend/src/App.vue

@@ -73,8 +73,9 @@ onUnmounted(() => {
 });
 
 function connectWebSocket() {
+  // Use relative path so Vite proxy can handle it
   const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
-  const wsUrl = `${protocol}//${window.location.hostname}:3001`;
+  const wsUrl = `${protocol}//${window.location.host}/ws`;
   
   ws = new WebSocket(wsUrl);