kbe 635644b55a feat(promotion-code): Complete promotion code integration and testing ...

- Add comprehensive promotion code methods to Order model
- Implement Stripe invoice integration for promotion code discounts
- Display promotion codes on invoice with proper discount breakdown
- Fix and enhance all unit tests for promotion code functionality
- Add discount calculation with capping to prevent negative totals
- Ensure promotion codes work across entire order lifecycle

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Co-Authored-By: Claude <noreply@anthropic.com>

2025-09-29 20:34:49 +02:00

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