POST /api/v1/checkout/ always converted the customer's entire
multi-store cart into orders. Add an optional store_uuids field to
CheckoutSerializer — when given, checkout() only processes those
stores' cart groups and only clears their items, leaving the rest of
the cart intact for a later checkout. Omitted, behavior is unchanged
(whole cart checks out).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Django 6 + DRF resource server against the Gooyal accounts OAuth2 service,
matching the Winsoo ecosystem's conventions. Covers locations, stores,
catalog, cart, checkout/orders (with the multi-store-cart split and the
status stepper), reviews, and notifications, plus a demo-data seed command.
Payment integration (wallet debits, online gateway, seller payouts) is
intentionally left out here — see feature/payment.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
