docs(r2): 阶段5 验收收口 + 新增跨线路交接说明 docs/routes/R2/

- r2-workflow:阶段5 验证记录、验收期修复(PATCH /users/me、.env OSS)
- routes/R2/README:R3(checkout 切换/删除守卫/状态触发权)、R4(designData
  整包合并回写/贴纸 COS 硬前置)、R1(productId 校验/iconImg 下发)接入须知
- routes/README 索引更新

Co-Authored-By: Claude <noreply@anthropic.com>
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2026-09-12 17:18:22 +08:00
co-authored by Claude
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| [R3 订单 + 支付占位](route-r3-order-pay.md) | `feat/r3-order-pay` | 服务端下单、金额重算、订单状态机、支付未配置占位 |
| [R4 上传 + 词云 + 线稿](route-r4-upload-wordcloud.md) | `feat/r4-upload-wordcloud` | COS 上传、wordcloud 契约冻结、sketch、任务轮询 |
**已收口路线的交接说明**(后续线路接入前必读):
- [R2 交接收口说明](R2/README.md)——R3/R4/R1 接入服务端化地址与设计清单前的事实、红线与待办。
## 合并顺序与依赖
- R1 是交易链路的前置,优先合入。