feat: backend MVP (auth/rbac, catalog, orders, fulfillment, invoices) + specs + scaffolds

openspec/changes/frontend-apps/tasks.md

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+# Tasks: frontend-apps
+
+## 1. Shared package
+- [x] @vmall/shared: types, API client, locales (en/zh), ui.css
+
+## 2. Scaffolds
+- [x] Three Nuxt apps: config, i18n, pinia session store, api plugin, layouts
+
+## 3. mall
+- [ ] Home: product grid + search + category filter + paging
+- [ ] Product detail with SKU picker, localized content, converted price
+- [ ] Cart page, checkout page (address form), orders list/detail, shipments, invoices, login/register
+
+## 4. shop-admin
+- [ ] Login guard, dashboard, products list/new/edit (i18n fields, SKUs), publish/unpublish
+- [ ] Orders, shipment creation + mark shipped, invoices list + issue
+
+## 5. admin
+- [ ] Login guard, users (role assignment), shops (create/suspend), orders, currencies (rate edit)
+
+## 6. Verification
+- [ ] All three apps build; browser smoke: register→shop create→product publish→purchase→ship→invoice in en + zh