BUGFIX: 系统消息发布 广播时消息数量错误

src/main/java/com/ai/da/service/impl/MessageCenterServiceImpl.java

@@ -194,6 +194,8 @@ public class MessageCenterServiceImpl extends ServiceImpl<NotificationMapper, No
         if (!type.equals("system")) {
             // 个人未读消息
             count = getUnreadCountByType(type, receiverId);
+        } else if (Objects.isNull(receiverId)) {
+            count = 1L;
         } else {
             // 系统未读消息
             count = getUnreadSystemNotification(receiverId);