style: apply ruff formatting to source and test files

app/domain/roles.py

@@ -1,8 +1,9 @@
 """Role-based access control definitions."""
 
+from collections.abc import Callable
 from enum import Enum
 from functools import wraps
-from typing import Any, Callable
+from typing import Any
 
 from app.domain.exceptions import ForbiddenException