feat(compare): comparison_results 增加 coupon_saved(平台红包优惠额)
- schema ComparisonResultIn 显式声明 coupon_saved(否则 model_dump 丢字段) - 上报→落库→读出贯通, 加 passthrough 测试(目标带值/源平台 null) - 更新 api/database 文档 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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**Item**:`{ name: string, qty: int=1, specs: string[]\|null }`
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**Result(comparison_results 元素)**:`{ platform_id, platform_name, package, price(元,float\|null), is_source(bool), rank(int\|null) }`
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**Result(comparison_results 元素)**:`{ platform_id, platform_name, package, price(元,float\|null), is_source(bool), rank(int\|null), coupon_saved(元,float\|null) }`
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- `coupon_saved`:该平台本单**平台主优惠额**(元)——美团红包 / 淘宝平台红包 / 京东优惠券·百亿补贴,**只取那一笔**,不含配送费减免/共减总额。仅外卖目标平台带值,源平台/没用为 `null`,前端记录页据此展示**「已优惠 ¥X」**(null 不展示)。
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## 服务端派生(客户端不用算)
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