- Update marketplace_product_fixtures to create translations
- Update test_marketplace_product.py for translation-based titles
- Update test_product.py for effective property tests
- Update test_order.py to use get_title() method
- Add comprehensive CSV processor tests for translations
- Update stats service tests for new flat response structure
- Fix product schema tests with required marketplace_product_id field
- Add helper function create_marketplace_product_with_translation()
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>