feat: use ClassifiedAdTitle value object for ClassifiedAd.title

domain/marketplace/classified_ad.py

@@ -2,6 +2,7 @@ from dataclasses import dataclass, field
 from decimal import Decimal
 
 from domain.marketplace.classified_ad_id import ClassifiedAdId
+from domain.marketplace.classified_ad_title import ClassifiedAdTitle
 from domain.marketplace.price import Price
 from domain.marketplace.user_id import UserId
 
@@ -10,6 +11,6 @@ from domain.marketplace.user_id import UserId
 class ClassifiedAd:
     id: ClassifiedAdId
     _ownerId: UserId
-    title: str
+    title: ClassifiedAdTitle
     text: str
     price: Price = field(default_factory=lambda: Price(amount=Decimal("0.00")))