feat: refactor Socket.IO server implementation and update README for queue system

app/page.tsx

@@ -15,11 +15,12 @@ export default function Home() {
   useEffect(() => {
     let mounted = true;
     // dynamic import to avoid bundling issues on server
-  import("socket.io-client").then(({ io }) => {
-  if (!mounted) return;
-  // default to the same origin and connect to the Next.js API route at /api/socket
-  const serverUrl = process.env.NEXT_PUBLIC_SOCKET_URL || window.location.origin;
-  const socket = io(serverUrl, { autoConnect: true, path: "/api/socket" });
+    import("socket.io-client").then(({ io }) => {
+      if (!mounted) return;
+      const socket = io({ 
+        path: "/api/socket",
+        autoConnect: true 
+      });
       socketRef.current = socket;
 
       socket.on("connect", () => {