fix: code review fixes + unit/API tests for repair-POS integration
Code review fixes:
- Wrap createFromRepairTicket() in DB transaction for atomicity
- Wrap complete() inventory + status updates in DB transaction
- Repair ticket status update now atomic with transaction completion
- Add Zod validation on from-repair route body
- Fix requiresDiscountOverride: threshold and manual_discount are independent checks
- Order discount distributes proportionally across line items (not first-only)
- Extract shared receipt calculations into useReceiptData/useBarcode hooks
- Add error handling for barcode generation
Tests:
- Unit: consumable tax category mapping, exempt rate short-circuit
- API: ready-for-pickup listing + search, from-repair transaction creation,
consumable exclusion from line items, tax rate verification (labor=service,
part=goods), duplicate prevention, ticket auto-pickup on payment completion,
isConsumable product filter
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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