修复：weblive 协程 panic 防护、Mongo 空指针防护、直播状态轮询退避

Made-with: Cursor

server/pkg/weblive/ws.go

@@ -120,7 +120,8 @@ func handlePublisherWS(c *gin.Context, h *Hub) {
 		log.Printf("weblive: publisher track kind=%s", track.Kind().String())
 		h.onPublisherTrack(track)
 		if track.Kind() == webrtc.RTPCodecTypeVideo {
-			go func(ssrc uint32) {
+			ssrc := uint32(track.SSRC())
+			goSafe("publisherPLI", func() {
 				_ = pc.WriteRTCP([]rtcp.Packet{&rtcp.PictureLossIndication{MediaSSRC: ssrc}})
 				ticker := time.NewTicker(2 * time.Second)
 				defer ticker.Stop()
@@ -131,7 +132,7 @@ func handlePublisherWS(c *gin.Context, h *Hub) {
 					}
 					_ = pc.WriteRTCP([]rtcp.Packet{&rtcp.PictureLossIndication{MediaSSRC: ssrc}})
 				}
-			}(uint32(track.SSRC()))
+			})
 		}
 	})