@

docs: reorganize api docs into categorized subdirectories and fill missing docs

- Categorize 77 existing api docs into 16 business-domain subdirectories
  (auth/ad/wallet/coupon/compare/savings/signin/tasks/invite/user/
   device/platform/intent/meituan/other) plus admin/ and internal/
- Split admin/ into 7 sub-resource subdirectories (auth/users/wallet/
  withdraws/feedbacks/admins/ad) with 4 single-file docs at root
- Create 21 new docs covering 28 previously undocumented endpoints:
  ad/watch-report, wallet/transfer-auth (3 endpoints), coupon/session+
  stats+completed-today+prompt (7), invite/me+invitees+bind+landing-track,
  user/onboarding (2), platform/flags+ad-config+app-version,
  intent/step+precoupon/step, analytics/events, order/report,
  report/submit+records, feedback/config+records, trace/finalize
- Add mock request/response JSON examples to all new docs
- Create docs/README.md with full category index for LLM navigation
- Update docs/api/README.md: fix all links, add new endpoint rows,
  replace "no doc" markers with actual links
- Fix back-navigation links (./README.md -> ../README.md or
  ../../README.md) in all moved files
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docs/api/compare/compare-stats.md

@@ -0,0 +1,25 @@
+# GET /api/v1/compare/stats — 比价口径战绩（「我的」页省钱战绩卡）
+
+> 所属:比价记录组（前缀 `/api/v1/compare`） | 鉴权:Bearer | [← 返回 API 索引](../README.md)
+
+## 入参
+无（用户由 token 确定）。
+
+## 出参
+响应 `200`:`CompareStatsOut`
+
+| 字段 | 类型 | 说明 |
+|---|---|---|
+| `compare_count` | int | 累计完成比价次数（`comparison_record` 中 `status='success'` 的记录数） |
+| `discovered_saved_cents` | int | 累计发现可省额（分；各成功比价 `saved_amount_cents`=源价−最低价 之和，null 不计） |
+
+## 说明
+「我的」页**省钱战绩卡**的数据源（**比价口径**）：
+
+- 卡主额「累计发现可省 ¥X」← `discovered_saved_cents`
+- 卡三列之「完成比价(次)」← `compare_count`
+- 卡「未比价锁定态」判据：`compare_count == 0`（没比过价 → 盖锁定蒙层，引导「立即开始」去首页比价）
+
+> ⚠️ **与下单口径解耦**：本接口只看「比过价」(`comparison_record`)，**不要求下单**。区别于 `savings_record`（下单成交记账，见 [savings-summary](./savings-summary.md) / [savings-records](./savings-records.md)）——那是订单记录/省钱明细的源。两表互不喂数据。
+
+> 卡另两项数据源：「赚取金币」← `GET /wallet/account.total_coin_earned`；「领取优惠券」后端暂无累计字段（前端先占位）。