Bernard Siebens 78fdcdf138 feat(shop): cart, order, invoice and discounts ...

Build out the shop domain: Cart/CartItem (one open cart per user per club),
Order/OrderLine, Discount/AppliedDiscount, Payment and Invoice.

Order and Invoice allocate a per-club, per-year sequential number
(ORD-<year>-<seq> / INV-<year>-<seq>) via shared helpers, retrying on collision
with the (club, number) unique constraint as the source of truth.

Fixes found while testing:
- Invoice had no number generator, so a second invoice in a club collided on
  the empty string and could never be created.
- AppliedDiscount printed a "%" suffix even for fixed-amount discounts, and had
  no (order, discount) uniqueness, so a discount could be applied twice.

Every model validates its club-scoped FKs (product/team/discount/order/season/
staff_role) against the owning club, and Member FKs against club membership.
Register all models in the admin, with FK dropdowns scoped to the owning club.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-07-13 14:42:29 +02:00

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