fix: add refresh before assigning promo_groups to avoid async lazy load error

app/database/crud/tariff.py

@@ -233,6 +233,8 @@ async def create_tariff(
     if promo_group_ids:
         promo_groups_result = await db.execute(select(PromoGroup).where(PromoGroup.id.in_(promo_group_ids)))
         promo_groups = promo_groups_result.scalars().all()
+        # Refresh чтобы избежать lazy load в async контексте
+        await db.refresh(tariff, ['allowed_promo_groups'])
         tariff.allowed_promo_groups = list(promo_groups)
 
     await db.commit()