refactor: enhance type hinting and casting for improved type safety across multiple files

tests/services/test_organization_service.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 from typing import cast
 from unittest.mock import MagicMock
 
-import pytest  # type: ignore[import-not-found]
+import pytest
 from app.models.organization import Organization
 from app.models.organization_member import OrganizationMember, OrganizationRole
 from app.repositories.org_repo import OrganizationRepository