定时任务，周计算调整。

plugins/message_push_task/main.py

@@ -403,6 +403,10 @@ class MessagePushTask(MessagePluginInterface):
                     # 计算下次执行时间
                     next_time = now.replace(hour=hour, minute=minute, second=second, microsecond=0) + timedelta(days=days_ahead)
 
+                    # 如果计算出的时间小于等于当前时间，说明计算有误，需要再加一周
+                    if next_time <= now:
+                        next_time = next_time + timedelta(days=7)
+
                 except (json.JSONDecodeError, ValueError, IndexError) as e:
                     self.LOG.error(f"处理每周执行日失败: {e}")
                     return None