partner_stores, store_inventories, store_purchases, store_sales tables.
Promotes qr_code_batches.target_store_id and qr_codes.assigned_to_store_id
to real FKs. StoreOperations service handles wholesale issuance
(generates fresh batch -> codes go allocated to store -> inventory tops
up -> StorePurchase recorded) and resident sales (codes flip allocated
-> active to a household, commission computed at the store's rate).
Admin endpoints: store CRUD, issue-inventory, record-sale.
160 feature tests passing.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
