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>

docs/ECR/ECR-014-membership-plan.md

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+# ECR-014
+
+**Title:** MembershipPlan（会员套餐配置薄切片）  
+**Status:** **Closed**  
+**Closed:** 2026-08-07（Loop continuous）  
+**Parent:** WAVE0-FROZEN (`27f27a1`)  
+**Predecessor:** ECR-013B **Closed**  
+**Change Level: L2**
+
+## Change
+
+1. Spec `ops-membership-plan.md`  
+2. Entity `MembershipPlan` 表 + 种子 month/quarter/year  
+3. Admin GET/PUT `/membership-plans*`  
+4. Grant / CreateOrder(membership) 读表  
+5. `docs/CONTRACT_DIFF/ECR-014.yaml`  
+6. **不含** 真支付 · 兑换码 · Entitlement · ask_pack
+
+## Scope Forbidden
+
+UGC · 真支付 · soft-delete User · 新建 plan code（本切片冻结三码）
+
+## Acceptance
+
+见 Spec L4。
+
+## Linked
+
+- Spec / PRODUCT / ENGINEERING / BD-2026-014 / CONTRACT_DIFF / HANDOFF / STATE / TASK