fix(rustproxy-http): improve HTTP/3 connection reuse and clean up stale proxy state

ts/proxies/smart-proxy/smart-proxy.ts

@@ -128,6 +128,7 @@ export class SmartProxy extends plugins.EventEmitter {
     }
 
     // Handle unexpected exit (only emits error if not intentionally stopping)
+    this.bridge.removeAllListeners('exit');
     this.bridge.on('exit', (code: number | null, signal: string | null) => {
       if (this.stopping) return;
       logger.log('error', `RustProxy exited unexpectedly (code=${code}, signal=${signal})`, { component: 'smart-proxy' });