docs(openspec): plan shop coupons, accounts, points, flash sales, and group buying

Capture exclusive promotion composition, empty-group cancel, and mall surface scope so the five marketing changes can be implemented without stacking or lifecycle ambiguity.

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

openspec/changes/add-points-mall/tasks.md

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+## 1. Prerequisite and persistence
+
+- [ ] 1.1 Confirm `customer-accounts` is archived and use its guarded internal points-debit service.
+- [ ] 1.2 Add additive migrations for platform points products, redemption orders, redemption items, status constraints, address snapshots, and indexes.
+- [ ] 1.3 Implement the Rust points module repositories and services for published catalog reads, admin product management, atomic redemption, history, and validated fulfillment transitions.
+
+## 2. Contract and backend proof
+
+- [ ] 2.1 Register customer and platform routes with appropriate roles and add shared types, client methods, locales, and fixed-data adapter parity.
+- [ ] 2.2 Add integration tests for unpublished-product rejection, insufficient points rollback, concurrent final stock, ownership filtering, and fulfillment transition validation.
+
+## 3. Application surfaces
+
+- [ ] 3.1 Add platform-admin points-product and redemption-order management screens and admin nav entries using the shared client.
+- [ ] 3.2 Replace mall points fixtures with live catalog, address-aware redemption, refreshed balance, and customer redemption history.
+- [ ] 3.3 Remove `INTEGRAL_PRODUCTS` and `USER_STATS` page imports without deleting fixed-data adapter support.
+
+## 4. Verification and specification
+
+- [ ] 4.1 Seed deterministic points products and credit demo customer points through the archived customer-accounts credit path (append-only entry, never an absolute balance write). Browser-smoke admin publication and customer redemption.
+- [ ] 4.2 Run cargo test for vmall-api, builds for mall and admin, and strict validation for this OpenSpec change.