feat: local storage logic & endpoints

app/domain/entities/__init__.py

@@ -1,5 +1,7 @@
 """Domain entities and value objects — pure, framework-free."""
 
+from app.domain.entities.storage import ObjectStat
+from app.domain.entities.track import Artist, Track
 from app.domain.entities.user import Credentials, User
 
-__all__ = ["Credentials", "User"]
+__all__ = ["Artist", "Credentials", "ObjectStat", "Track", "User"]