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

2026-09-17 12:43:22 +08:00
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+# Spec delta: cart
+
+## ADDED Requirements
+
+### Requirement: Server-side cart
+Authenticated shoppers SHALL have a Redis-backed cart keyed by user id, containing sku_id + qty entries.
+
+#### Scenario: add and update
+- **WHEN** a shopper POSTs sku + qty, then PUTs a new qty
+- **THEN** GET /api/cart reflects the latest qty with current price/name snapshot
+
+#### Scenario: unpurchasable SKU rejected
+- **WHEN** adding a SKU that is inactive or whose product is not published
+- **THEN** the API returns 400