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

openspec/changes/catalog-i18n-currency/tasks.md

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+# Tasks: catalog-i18n-currency
+
+## 1. Schema
+- [ ] Migration: currencies, categories, products, skus; product status enum
+- [ ] Seed currencies (USD base, CNY, EUR, JPY) + demo categories (bilingual)
+
+## 2. Currency APIs
+- [ ] GET /api/currencies (public, enabled only)
+- [ ] GET /api/currencies/convert?amount_minor&from&to
+
+## 3. Public catalog APIs
+- [ ] GET /api/products (paged; filters: category_id, q, shop_id; only published)
+- [ ] GET /api/products/{id_or_slug} (published only, with SKUs)
+- [ ] GET /api/categories
+
+## 4. Shop-admin catalog APIs
+- [ ] GET/POST /api/shop/products, PUT /api/shop/products/{id}
+- [ ] POST /api/shop/products/{id}/publish | /unpublish
+- [ ] POST /api/shop/products/{id}/skus (upsert by sku_code)
+
+## 5. Tests
+- [ ] cargo test: publish lifecycle visibility, i18n fields round-trip, currency conversion math, shop isolation