先对齐三个主数据
房间号、订单号、设备编号必须有唯一映射，建议由 PMS 侧下发映射表。
接口清单
- 房态变更推送：入住 / 退房 / 换房
- 消费记账：设备出货后推送订单
- 设备事件：故障 / 离线 / 补货提醒
对账机制
每日凌晨做一次双向对账，差异条目进入人工处理队列，避免月底集中暴露。
幂等与重试
所有写接口必须支持幂等键，网络抖动时按指数退避重试。
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