fix: 完善直播结束通知与 WebSocket 连接

backend/internal/chat/hub.go

@@ -18,7 +18,7 @@ const (
 )
 
 type Message struct {
-	Type      string `json:"type"` // "chat", "system", "danmaku"
+	Type      string `json:"type"` // "chat", "system", "danmaku", "stream_end"
 	Username  string `json:"username"`
 	Content   string `json:"content"`
 	RoomID    string `json:"room_id"`
@@ -190,7 +190,15 @@ func (r *roomHub) handleBroadcast(message Message) {
 			delete(r.clients, client)
 		}
 	}
+	shouldDeleteIfIdle := message.Type == "stream_end"
+	if shouldDeleteIfIdle {
+		r.history = nil
+	}
 	r.mutex.Unlock()
+
+	if shouldDeleteIfIdle {
+		r.manager.deleteRoomIfIdle(r)
+	}
 }
 
 func (r *roomHub) handleClearHistory() {
@@ -223,6 +231,15 @@ func (h *Hub) BroadcastToRoom(msg Message) {
 	h.getOrCreateRoom(msg.RoomID).broadcast <- msg
 }
 
+func (h *Hub) NotifyStreamEnded(roomID string) {
+	h.BroadcastToRoom(Message{
+		Type:     "stream_end",
+		Username: "System",
+		Content:  "The host has ended the live stream.",
+		RoomID:   roomID,
+	})
+}
+
 func (c *Client) ReadPump() {
 	defer func() {
 		c.Hub.UnregisterClient(c)

backend/internal/stream/server.go

@@ -172,7 +172,7 @@ func NewRTMPServer(rtmpPort string) *RTMPServer {
 						monitor.Warnf("Failed to mark room inactive room_id=%s: %v", roomID, err)
 					}
 				}
-				chat.MainHub.ClearRoomHistory(roomID)
+				chat.MainHub.NotifyStreamEnded(roomID)
 				monitor.Infof("Publishing ended for room_id=%s", roomID)
 			} else {
 				monitor.Infof("Variant publishing ended for room_id=%s path=%s", roomID, channelPath)