feat: 添加 GateServer 模块并创建服务端基础框架

- 新增 GateServer 类，实现基本的 TCP 服务器功能
- 创建服务端启动脚本，定义数据处理和事件监听逻辑
- 添加 package.json 文件，配置项目信息和启动脚本

GateServer/index.js

@@ -0,0 +1,38 @@
+const net = require('net');
+const EventEmitter = require('events');
+
+class GateServer extends EventEmitter {
+    constructor(port, host) {
+        super();
+        this.port = port;
+        this.host = host;
+        this.server = net.createServer(this.handleConnection.bind(this));
+    }
+
+    start() {
+        this.server.listen(this.port, this.host, () => {
+            console.log(`GateServer is listening on ${this.host}:${this.port}`);
+        });
+    }
+
+    handleConnection(socket) {
+        console.log('New client connected');
+        this.emit('connection', socket);
+
+        socket.on('data', (data) => {
+            this.emit('data', socket, data);
+        });
+
+        socket.on('end', () => {
+            console.log('Client disconnected');
+            this.emit('end', socket);
+        });
+
+        socket.on('error', (err) => {
+            console.error('Socket error:', err);
+            this.emit('error', err);
+        });
+    }
+}
+
+module.exports = GateServer;