Lorenz Hilpert 1e9ac30b4d refactor(checkout): separate data-access layer boundaries
Extract domain-specific operations from CheckoutService into dedicated services to respect data-access layer boundaries and improve separation of concerns.

## Changes

### New Services Created

**OrderCreationService** (oms-data-access)
- createOrdersFromCheckout(): Creates orders from completed checkout
- getLogistician(): Retrieves logistician (default '2470')
- 8 unit tests with Jest/Spectator

**AvailabilityService** (catalogue-data-access)
- validateDownloadAvailabilities(): Validates download items availability
- getDigDeliveryAvailability(): Gets DIG-Versand availability
- getB2bDeliveryAvailability(): Gets B2B-Versand availability
- 15 unit tests with Jest/Spectator

**BranchService** (remission-data-access)
- getDefaultBranch(): Gets default/current branch for user
- 5 unit tests with Angular Testing Utilities
- Note: Temporary location, will move to inventory-data-access

### CheckoutService Refactoring

**Removed cross-domain imports:**
- @generated/swagger/oms-api
- @generated/swagger/availability-api
- @generated/swagger/inventory-api

**Added domain service dependencies:**
- @isa/oms/data-access (OrderCreationService)
- @isa/catalogue/data-access (AvailabilityService)
- @isa/remission/data-access (BranchService)

**Code reduction:**
- Removed 254 lines (25.5% reduction: 996 → 742 lines)
- Deleted 8 private methods moved to domain services

### Test Updates

- Updated checkout.service.spec.ts with new service mocks
- Fixed Zod validation (buyerType/payerType literals)
- All 29 tests passing (8+15+5+11)

### AbortSignal Policy

Removed abortSignal from data-mutating operations:
- OrderCreationService.createOrdersFromCheckout() (POST)
- Kept abortSignal for read-only operations per project convention

## Impact

- Better separation of concerns
- Improved maintainability (smaller, focused services)
- Respects data-access layer boundaries
- No functional changes (100% backward compatible)
- 0 TypeScript compilation errors
2025-10-06 17:09:12 +02:00
2025-10-02 20:25:50 +02:00
2025-06-16 11:54:47 +02:00
2020-04-17 12:17:30 +02:00
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2025-07-21 22:35:11 +02:00
2025-02-24 15:29:32 +01:00
2020-02-05 09:51:29 +01:00

Hima

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