feat(coupon): 领券今日状态后端(弹窗频控 + 领券记录) (#23)
- 两张表 + Alembic 迁移:coupon_prompt_engagement(device×日,弹窗频控源)/ coupon_claim_record(device×券×日,领券记录·资产)
- coupon/step 透传顺手写库:step0 写 engagement(claim_started);响应解析 last_coupon_result/coupon_results 幂等写 claim record(按 coupon_id 去重,避免 done 帧 last 与 coupon_results 重复在 autoflush=False 下撞唯一约束回滚整批)
- 新增 GET /coupon/prompt/should-show(弹窗判据)+ POST /coupon/prompt/dismiss(拒绝通知,透传链路看不到拒绝)
- 判断按 device_id(券发到设备登录的外卖账号,比 user 更贴近登录环境);user_id 仅资产留痕、可空
- MVP 先不去重(队列照旧全发);pricebot 未改
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Reviewed-on: #23
marco
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