- 新增 POST /admin/review/{id}/revert body={targetStatus, remark}
- 仅允许 APPROVED↔REJECTED 互转, MACHINE_REJECTED 仍走 /override-approve
- ReviewVO/ReviewListVO 加 revertRemark 审计字段(MpReviewVO 不加)
- 错误码 551076 REVERT_STATUS_NOT_ALLOWED
- 现有 /approve /reject /override-approve 完全不动