feat: three nuxt frontends, demo seed, rounding + money-exponent + rate-cast fixes, archived specs

openspec/changes/archive/2026-09-17-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
+- [x] Home: product grid + search + category filter + paging
+- [x] Product detail with SKU picker, localized content, converted price
+- [x] Cart page, checkout page (address form), orders list/detail, shipments, invoices, login/register
+
+## 4. shop-admin
+- [x] Login guard, dashboard, products list/new/edit (i18n fields, SKUs), publish/unpublish
+- [x] Orders, shipment creation + mark shipped, invoices list + issue
+
+## 5. admin
+- [x] Login guard, users (role assignment), shops (create/suspend), orders, currencies (rate edit)
+
+## 6. Verification
+- [x] All three apps build; browser smoke: register→shop create→product publish→purchase→ship→invoice in en + zh