完善直播节点监控与边缘代理

frontend/src/api/streams.ts

@@ -26,6 +26,7 @@ export interface WatchInfo {
   title: string
   status: string
   multicast_available: boolean
+  selected_node?: { id: string; name: string } | null
   lines: LineInfo[]
   qualities: QualityInfo[]
 }