feat: 帖子分级置顶（板块/全站）与板块管理员置顶权限、消息管理权限调整

backend/handler/realtime.go

@@ -61,7 +61,7 @@ func (h *Handlers) RealtimeWS(c *gin.Context) {
 	canOverseeChat := false
 	if actor, loadErr := h.Auth.LoadActor(claims.ID); loadErr == nil {
 		isStaff = actor.IsStaff()
-		canOverseeChat = service.CanOverseeChat(actor.Role)
+		canOverseeChat = actor.CanOverseeChat()
 	}
 
 	client := realtime.NewClient(
@@ -74,7 +74,7 @@ func (h *Handlers) RealtimeWS(c *gin.Context) {
 			return verr == nil
 		},
 		func() { h.Auth.TouchLastSeen(claims.ID) },
-		// 动态房间订阅鉴权：成员可订阅；站长/超管旁路可订阅任意群
+		// 动态房间订阅鉴权：成员可订阅；站长/已授权超管旁路可订阅任意群
 		func(room string) bool {
 			roomID, ok := parseWSChatRoom(room)
 			if !ok {