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

openspec/changes/archive/2026-09-17-frontend-apps/proposal.md

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+# Proposal: frontend-apps
+
+## Why
+The API needs its three user-facing surfaces: customer storefront (mall), merchant console (shop-admin), and platform console (admin) — all Nuxt 3, all bilingual (en/zh), with the mall offering multi-currency display.
+
+## What changes
+- Shared package @vmall/shared: API contract types, typed API client, en/zh locales, base stylesheet.
+- mall (port 3000): product browsing w/ search+category, product detail, cart, checkout, orders, shipments, invoices, login/register, currency switcher (display conversion).
+- shop-admin (3001): dashboard, product CRUD + publish/unpublish + SKU editing, order list, shipment creation/ship, invoice issue.
+- admin (3002): user role assignment, shop creation/suspension, order oversight, currency management (rates).
+
+## Non-goals
+- SSR SEO tuning, design-system polish beyond the shared stylesheet, e2e test suites (smoke-verified in browser).
+
+## Capabilities
+- `frontend-mall`: shopper experience.
+- `frontend-shop-admin`: merchant experience.
+- `frontend-admin`: platform operator experience.