后台直播：修复信令误断（onclose 提示与严格模式 onUnmounted）

Made-with: Cursor

admin/src/utils/liveWebRTC.js

@@ -33,6 +33,8 @@ export function startPublishing(opts = {}) {
   const ws = new WebSocket(wsUrl)
   const pc = new RTCPeerConnection({ iceServers: defaultIce })
   let stream = null
+  /** 本地主动 stop / 摄像头失败关闭，避免 onclose 覆盖真实错误提示 */
+  let closedByLocal = false
 
   const send = (o) => {
     if (ws.readyState === WebSocket.OPEN) ws.send(JSON.stringify(o))
@@ -56,7 +58,14 @@ export function startPublishing(opts = {}) {
       send({ type: 'offer', sdp: offer.sdp })
       onStatus('已发起推流协商，等待服务端应答…')
     } catch (err) {
-      onStatus(err.message || '无法打开摄像头')
+      const name = err && err.name
+      let tip = err.message || '无法打开摄像头'
+      if (name === 'NotAllowedError' || name === 'PermissionDeniedError') {
+        tip = '已拒绝摄像头权限：请在浏览器地址栏允许摄像头，并确认本页为 HTTPS。'
+      } else if (name === 'NotFoundError') {
+        tip = '未检测到摄像头设备。'
+      }
+      onStatus(tip)
       stop()
     }
   }
@@ -86,10 +95,18 @@ export function startPublishing(opts = {}) {
     }
   }
 
-  ws.onerror = () => onStatus('信令连接失败（请确认已登录且 Nginx 已配置 WebSocket）')
-  ws.onclose = () => onStatus('信令已断开')
+  ws.onerror = () => {
+    if (!closedByLocal) {
+      onStatus('信令连接失败（请确认已登录且 Nginx 已配置 WebSocket）')
+    }
+  }
+  ws.onclose = () => {
+    if (closedByLocal) return
+    onStatus('信令已断开：服务端关闭连接或网络中断。若刚能连上即断，请查服务端日志或配置 TURN（LIVE_ICE_SERVERS）。')
+  }
 
   function stop() {
+    closedByLocal = true
     try {
       ws.close()
     } catch (_) {}