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

README.md

@@ -47,8 +47,8 @@ This repository contains a minimal demo of a queue system for high-concurrency t
 
 Files added in this demo:
 
-- `server/index.js` — simple Socket.IO server with in-memory queue logic and JWT issuance (demo only).
-- `.env.example` — example environment variables for running the socket server.
+- `pages/api/socket.js` — Next.js API route with Socket.IO server, in-memory queue logic and JWT issuance (demo only).
+- `.env.example` — example environment variables for the queue system.
 - `app/page.tsx` — client UI (Next.js) that connects via Socket.IO and displays queue position, estimated wait, and purchase button.
 
 Important notes and limitations:
@@ -59,26 +59,19 @@ Important notes and limitations:
 Running locally
 
 1. Copy `.env.example` to `.env` and adjust values (especially `JWT_SECRET`).
-2. Install dependencies for the server and client:
+2. Install dependencies (already included in package.json):
 
 ```powershell
 pnpm install
-pnpm --filter . add socket.io socket.io-client jsonwebtoken dotenv mysql2
 ```
 
-3. Start the Socket.IO server:
-
-```powershell
-node server/index.js
-```
-
-4. Start the Next.js dev server:
+3. Start the Next.js dev server (includes the Socket.IO API route):
 
 ```powershell
 pnpm dev
 ```
 
-5. Open `http://localhost:3000` and the client will connect to the socket server (default `http://localhost:4000`).
+4. Open `http://localhost:3000` and the client will connect to the Socket.IO API route at `/api/socket`.
 
 Next steps / improvements