- Phase 5: Seller Portal from scratch (zero backend bytes exist today) -
SellerOrganization/SellerUser/SellerMarketplaceMembership, all endpoints
scoped server-side to the unified-orders Fulfillment model from Phase 2.
- Phase 6: server-owned Cart/CartLine/CheckoutSession, extending Phase 1's
server-authoritative-amount contract into the cart itself. Replaces
localStorage/Telegram-CloudStorage cart persistence.
- Phase 7: Refund and ReconciliationRecord entities, settlement contract.
Flags additional payment providers (wallets/BNPL) as still an open
business decision - not blocking, schema is provider-agnostic already.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
