- Add create_letzshop_order() for importing Letzshop orders
- Add find_or_create_customer() for marketplace imports (inactive by default)
- Add set_order_tracking() for shipping updates
- Add update_item_state() for marketplace confirmation flow
- Add get_order_by_external_shipment_id() for Letzshop lookups
- Update all methods to use snapshot fields instead of address FKs
- Products must exist by GTIN - raises error if not found
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Samir Boulahtit
cb6656815e