feat(ECR-014): MembershipPlan 套餐配置并 Closed

membership_plans 表、admin 套餐页、Grant/CreateOrder 读表； Loop continuous 自动 Approve/Closed。Next：ECR-015 RedemptionCode。 Co-authored-by: Cursor <cursoragent@cursor.com>
2026-08-07 18:03:38 +08:00
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+# Backend Design: ECR-014 MembershipPlan
+
+| ID | BD-2026-014 |
+| ECR | ECR-014 |
+| Status | Approved |
+| Coding | Authorized（Loop） |
+| Change Level | L2 |
+| Risk | Low |
+
+## Change Boundary
+
+```text
+Domain: MembershipPlan
+App: admin + membership CreateOrder amount/days
+Infra: migration + repo
+API: /admin/membership-plans*
+Migration: YES
+Tests: integration
+```
+
+## Rollback
+
+down migration；回退硬编码 planDays/amount