feat(ECR-024): OpsCMS Banner 只读并 Closed

运营横幅目录（ops_banners + admin /cms），锁定 024–040 全队列。 Co-authored-by: Cursor <cursoragent@cursor.com>
2026-08-08 03:05:55 +08:00
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+# Backend Design: ECR-024 Banner
+
+| ID | BD-2026-024 |
+| Status | Approved |
+| Coding | Loop authorized |
+| Level | L2 |
+| Migration | YES 000025 |
+
+## Backend Change Boundary
+
+```text
+Domain: Banner (read)
+App: AdminHandler → admin.Service → AdminRepo
+API: GET /admin/cms/banners; GET /admin/cms/banners/{id}
+Permission: admin.cms.read
+Migration: 000025
+```
+
+## Out of boundary
+
+Banner 写发布 · FeedSlot · ScheduledPublication · UGC · 真支付
+
+Rollback: down migration + remove routes/UI