更新开发文档和技能索引，优化角色驱动的技能使用规范。调整了各角色的主技能和辅助技能的描述，确保开发者在不同目录下遵循相应的开发风格和流程。增加了变更关联检查的要求，确保代码变更后进行必要的检查以防漏改。

.cursor/scripts/db-exec/node_modules/mysql2/lib/server.js

@@ -0,0 +1,37 @@
+'use strict';
+
+const net = require('net');
+const EventEmitter = require('events').EventEmitter;
+
+const Connection = require('./connection');
+const ConnectionConfig = require('./connection_config');
+
+// TODO: inherit Server from net.Server
+class Server extends EventEmitter {
+  constructor() {
+    super();
+    this.connections = [];
+    this._server = net.createServer(this._handleConnection.bind(this));
+  }
+
+  _handleConnection(socket) {
+    const connectionConfig = new ConnectionConfig({
+      stream: socket,
+      isServer: true,
+    });
+    const connection = new Connection({ config: connectionConfig });
+    this.emit('connection', connection);
+  }
+
+  listen(port) {
+    this._port = port;
+    this._server.listen.apply(this._server, arguments);
+    return this;
+  }
+
+  close(cb) {
+    this._server.close(cb);
+  }
+}
+
+module.exports = Server;