kbe 6be8b95ed3 feat: Implement event image upload system for promoters ...

- Add Active Storage migrations for file attachments
- Update Event model to handle image uploads with validation
- Replace image URL fields with file upload in forms
- Add client-side image preview with validation
- Update all views to display uploaded images properly
- Fix JSON serialization to prevent stack overflow in API
- Add custom image validation methods for format and size
- Include image processing variants for different display sizes
- Fix promotion code test infrastructure and Stripe configuration

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

2025-09-30 00:41:03 +02:00

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