Исправлена ошибка MissingGreenlet при использовании Wild Card

Добавлена загрузка bonus_assignments через selectinload для wild_card,
чтобы избежать lazy loading в асинхронном контексте.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/api/v1/shop.py

@@ -190,8 +190,8 @@ async def use_consumable(
         if not data.assignment_id:
             raise HTTPException(status_code=400, detail=f"assignment_id is required for {data.item_code}")
 
-        # For copycat, we need bonus_assignments to properly handle playthrough
-        if data.item_code == "copycat":
+        # For copycat and wild_card, we need bonus_assignments to properly handle playthrough
+        if data.item_code in ("copycat", "wild_card"):
             result = await db.execute(
                 select(Assignment)
                 .options(selectinload(Assignment.bonus_assignments))