refactor(business): DRY‑up promo validation & optimize creation logic #28
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- Apply DRY: extract shared validation rules into dedicated `PromoValidator` to eliminate duplication between `PromoCreateSerializer` and `PromoDetailSerializer` - Implement atomic promo creation via `PromoManager.create_promo()` using `@transaction.atomic` for full rollback on error - Move custom model managers into `managers.py` for cleaner structure
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PromoValidatorto eliminate duplication betweenPromoCreateSerializerandPromoDetailSerializerPromoManager.create_promo()using@transaction.atomicfor full rollback on errormanagers.pyfor cleaner structure