@

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
@

docs/api/platform/platform-flags.md

@@ -0,0 +1,28 @@
+# GET /api/v1/platform/flags — 客户端 Feature Flags
+
+> 所属:Platform 组（前缀 `/api/v1/platform`） | 鉴权:无 | [← 返回 API 索引](../README.md)
+
+客户端拉取运营开关并缓存（app 启动 / 每场比价开始时刷新）。不鉴权：开关非敏感，且比价无障碍服务取值时未必有登录态。值来自 `app_config`（admin 可改），空库回退默认。
+
+## 入参
+
+无。
+
+## 出参
+
+响应 `200`:`AppFlagsOut`
+
+| 字段 | 类型 | 说明 |
+|---|---|---|
+| `comparing_ad_enabled` | bool | 比价/领券期是否展示信息流广告（远程 kill-switch） |
+
+Mock 出参:
+```json
+{
+  "comparing_ad_enabled": true
+}
+```
+
+## 说明
+- 客户端拉取后本地缓存，避免每次请求
+- 空库回退默认值（false）