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

2026-09-17 13:34:38 +08:00
parent dc9fd31c5e
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+# Proposal: cart-checkout-orders
+
+## Why
+Shoppers must be able to collect items and place orders. Checkout splits the cart into one order per shop (B2B2C requirement), snapshots prices, and decrements stock atomically.
+
+## What changes
+- Redis-backed cart per authenticated user (add/update/remove/list), merged SKU + product snapshot at read time.
+- Checkout: validate stock + published status, create orders (one per shop) with items, decrement stock in a transaction, clear cart.
+- Order lifecycle: pending_payment → paid (mock pay endpoint) → fulfilling → shipped → completed; customer cancel while pending_payment.
+- Customer APIs: my orders list/detail, cancel, mock-pay.
+
+## Non-goals
+- Real payment gateways, partial refunds, guest checkout.
+
+## Capabilities
+- `cart`: server-side cart.
+- `order`: checkout, order lifecycle, customer order APIs.