feat(ECR-018): Entitlement 用户权益只读并 Closed

聚合 GET /admin/users/:id/entitlements（Membership∪DeepAccess∪问答额度）与 admin-h5 权益 Tab；无 migration / 无真支付。

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

docs/CONTRACT_DIFF/ECR-018.yaml

@@ -0,0 +1,17 @@
+ecr: ECR-018
+capability: CommerceEntitlement
+bounded_context: Membership_Orders
+parent: WAVE0-FROZEN
+predecessor: ECR-017
+change:
+  type: additive
+breaking_change: false
+migration_required: false
+compatibility_notes: >
+  Additive read API GET /admin/users/{id}/entitlements.
+  Aggregates memberships + deep_accesses + ask quotas; no schema change.
+
+apis:
+  - method: GET
+    path: /api/v1/admin/users/{id}/entitlements
+    change: added