fix: 优化网页端不能连接的问题

WebRTCControllerWeb/src/services/SignalingClient.js

@@ -18,6 +18,8 @@ export class SignalingClient {
       this.ws.onopen = () => {
         this.register();
         this.onConnected && this.onConnected();
+        // 启动心跳保活：每 25 秒发送 ping，防止中间代理或服务器因空闲超时断开连接
+        this._startHeartbeat();
       };
       this.ws.onmessage = (ev) => {
         let msg;
@@ -28,13 +30,38 @@ export class SignalingClient {
         }
         this.onMessage && this.onMessage(msg);
       };
-      this.ws.onclose = () => this.onDisconnected && this.onDisconnected();
-      this.ws.onerror = (e) => this.onError && this.onError(e?.message || 'WebSocket 错误');
+      this.ws.onclose = (ev) => {
+        // 记录关闭码和原因，便于诊断断连根因：
+        // 1000 = 正常关闭, 1001 = 离开, 1006 = 异常断开（无 close frame）
+        // 1009 = 消息过大, 1011 = 服务端异常
+        console.warn('[信令] WebSocket 已关闭 code=%d reason=%s wasClean=%s',
+          ev.code, ev.reason || '(无)', ev.wasClean);
+        this._stopHeartbeat();
+        this.onDisconnected && this.onDisconnected(ev.code, ev.reason);
+      };
+      this.ws.onerror = (e) => {
+        console.error('[信令] WebSocket 错误', e);
+        this.onError && this.onError(e?.message || 'WebSocket 错误');
+      };
     } catch (e) {
       this.onError && this.onError(e.message);
     }
   }
 
+  _startHeartbeat() {
+    this._stopHeartbeat();
+    this._heartbeatTimer = setInterval(() => {
+      if (this.ws && this.ws.readyState === WebSocket.OPEN) {
+        // 发送轻量级 ping 消息，保持连接活跃（服务端会忽略未知类型消息）
+        try { this.ws.send(JSON.stringify({ type: 'PING' })); } catch { /* ignore */ }
+      }
+    }, 25000);
+  }
+
+  _stopHeartbeat() {
+    if (this._heartbeatTimer) { clearInterval(this._heartbeatTimer); this._heartbeatTimer = null; }
+  }
+
   register() {
     this.send({
       type: 'REGISTER',
@@ -79,6 +106,7 @@ export class SignalingClient {
   }
 
   disconnect() {
+    this._stopHeartbeat();
     if (this.ws) {
       this.ws.close();
       this.ws = null;