refactor(socket-utils): replace direct socket cleanup with centralized cleanupSocket utility across connection management

ts/proxies/smart-proxy/port-manager.ts

@@ -2,6 +2,7 @@ import * as plugins from '../../plugins.js';
 import type { ISmartProxyOptions } from './models/interfaces.js';
 import { RouteConnectionHandler } from './route-connection-handler.js';
 import { logger } from '../../core/utils/logger.js';
+import { cleanupSocket } from '../../core/utils/socket-utils.js';
 
 /**
  * PortManager handles the dynamic creation and removal of port listeners
@@ -64,8 +65,7 @@ export class PortManager {
     const server = plugins.net.createServer((socket) => {
       // Check if shutting down
       if (this.isShuttingDown) {
-        socket.end();
-        socket.destroy();
+        cleanupSocket(socket, 'port-manager-shutdown');
         return;
       }