直播后台：新增按 IP 发言管控与在线会话视图。

支持全体禁言、单 IP 禁言/解禁与同 IP 本地限频，同时在开播页展示在线会话明细并补充实时优先码率策略，兼顾实时性与并发承载。

Made-with: Cursor

server/pkg/weblive/danmaku.go

@@ -34,7 +34,7 @@ var allowedGifts = map[string]struct{}{
 
 var (
 	danmakuClientsMu sync.Mutex
-	danmakuClients   = make(map[*websocket.Conn]struct{})
+	danmakuClients   = make(map[*websocket.Conn]string)
 )
 
 func writeDanmakuJSON(ws *websocket.Conn, v any) error {
@@ -71,12 +71,15 @@ func handleDanmakuWS(c *gin.Context) {
 		return
 	}
 	ws.SetReadLimit(4096)
+	clientIP := c.ClientIP()
+	sessionID := RegisterOnlineSession("danmaku", clientIP, fromDisplay)
 
 	danmakuClientsMu.Lock()
-	danmakuClients[ws] = struct{}{}
+	danmakuClients[ws] = clientIP
 	danmakuClientsMu.Unlock()
 
 	defer func() {
+		UnregisterOnlineSession(sessionID)
 		danmakuClientsMu.Lock()
 		delete(danmakuClients, ws)
 		danmakuClientsMu.Unlock()
@@ -91,6 +94,23 @@ func handleDanmakuWS(c *gin.Context) {
 		if mt != websocket.TextMessage {
 			continue
 		}
+		TouchOnlineSession(sessionID)
+		if IsMutedForIP(clientIP) {
+			_ = writeDanmakuJSON(ws, map[string]interface{}{
+				"type":    "error",
+				"code":    "muted",
+				"message": "当前已被禁言",
+			})
+			continue
+		}
+		if !AllowSendByIP(clientIP) {
+			_ = writeDanmakuJSON(ws, map[string]interface{}{
+				"type":    "error",
+				"code":    "rate_limited",
+				"message": "同 IP 发送过快，请稍后再试",
+			})
+			continue
+		}
 		if !canSend {
 			_ = writeDanmakuJSON(ws, map[string]interface{}{
 				"type":    "error",