feat(ECR-006): 落地运营后台 Phase A（admin API + admin-h5）

新增独立鉴权的 /api/v1/admin 与 Vue 控制台；会员授予与审计同事务，并补集成/单测。

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/STATE/ECR-006.md

@@ -0,0 +1,14 @@
+# STATE — ECR-006
+
+| Field | Value |
+|-------|-------|
+| ECR | ECR-006 |
+| Status | Closed |
+| Owner | — |
+| Phase | done |
+| Spec | `.ai/product/feature-spec/ops-admin.md` |
+| BACKEND_DESIGN | BD-2026-006 Approved |
+| Review | PASS · CODE_REVIEW/ECR-006.md |
+| Updated | 2026-08-06 |
+
+Phase A shipped: admin API + admin-h5.