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/service/chat.go

@@ -42,11 +42,6 @@ var (
 	ErrChatAdminAccess     = errors.New("无权管理消息")
 )
 
-// CanOverseeChat 站长/超管可旁路查看全部群（含私聊）并撤回任意消息
-func CanOverseeChat(role model.Role) bool {
-	return role == model.RoleOwner || role == model.RoleSuperAdmin
-}
-
 const (
 	chatNameMinRune = 2
 	chatNameMaxRune = 32
@@ -929,7 +924,7 @@ func (s *ChatService) isChatRoomModerator(userID, roomID uint) bool {
 	return m.Role == model.ChatRoleOwner || m.Role == model.ChatRoleAdmin
 }
 
-// hasSiteGroupMessagePerm 站点消息管理 flag（不含超管/站长，调用方通常已判 oversee）
+// hasSiteGroupMessagePerm 站点消息管理 flag（不含站长，超管经 oversee 已放行；调用方通常已判 oversee）
 func (s *ChatService) hasSiteGroupMessagePerm(userID uint) bool {
 	var u model.User
 	if err := s.db.Select("can_manage_messages").First(&u, userID).Error; err != nil {
@@ -1219,7 +1214,7 @@ type AdminChatMessageItem struct {
 }
 
 // AdminListMessages 按房间类型分页；scope 限制可见房间；非全站监管脱敏已撤回正文。
-// actor 为站长/超管：全站；HasSiteMessagePerm：全部群聊（无私聊）；否则仅群管房间。
+// actor 为站长或已授权超管：全站；HasSiteMessagePerm：全部群聊（无私聊）；否则仅群管房间。
 func (s *ChatService) AdminListMessages(actor *Actor, page int, keyword, roomType string) ([]AdminChatMessageItem, int64, error) {
 	if actor == nil || !s.CanAccessAdminMessages(actor) {
 		return nil, 0, ErrChatAdminAccess
@@ -1227,7 +1222,7 @@ func (s *ChatService) AdminListMessages(actor *Actor, page int, keyword, roomTyp
 	if page < 1 {
 		page = 1
 	}
-	fullOversee := CanOverseeChat(actor.Role)
+	fullOversee := actor.CanOverseeChat()
 	siteGroup := actor.HasSiteMessagePerm() && !fullOversee
 	if roomType != model.ChatRoomTypeGroup && roomType != model.ChatRoomTypeDirect {
 		return nil, 0, errors.New("房间类型无效")