feat: implement advanced reward management and wheel customization

- Add customizable background color
- Add wheel animations and sound effects
- Add reward description field and winner modal
- Change font to Dana
- Add configurable reward probabilities
- Support reward types (Empty, Discount Code, LiveCoin)
- Replace reward title with reward type selector
- Allow wheel page title customization from admin panel

backend/services/crud.py

@@ -5,18 +5,27 @@ from app.db.models import Item
 def get_items(db: Session):
     return db.query(Item).all()
 
-def create_item(db: Session, title: str, value: int):  # ✅ prize → value
-    item = Item(title=title, value=value)              # ✅ prize → value
+def create_item(db: Session, title: str, prize: str, description: str = "", prize_type: str = "پوچ", probability: float = 1.0):
+    item = Item(
+        title=title,
+        prize=prize,
+        description=description,
+        prize_type=prize_type,
+        probability=probability
+    )
     db.add(item)
     db.commit()
     db.refresh(item)
     return item
 
-def update_item(db: Session, item_id: int, title: str, value: int):  # ✅ prize → value
+def update_item(db: Session, item_id: int, title: str, prize: str, description: str = "", prize_type: str = "پوچ", probability: float = 1.0):
     item = db.query(Item).filter(Item.id == item_id).first()
     if item:
         item.title = title
-        item.value = value  # ✅ prize → value
+        item.prize = prize
+        item.description = description
+        item.prize_type = prize_type
+        item.probability = probability
         db.commit()
         db.refresh(item)
     return item
@@ -32,4 +41,5 @@ def spin_wheel(db: Session):
     items = db.query(Item).all()
     if not items:
         return None
-    return random.choice(items)
+    weights = [item.probability for item in items]
+    return random.choices(items, weights=weights, k=1)[0]