Refactor(backend): improve formatting in services, repositories & tests

- Consistently format multi-line function headers, exception handling, and repository method calls for readability.
- Reorganize misplaced imports across modules (e.g., services & tests) into proper sorted order.
- Adjust indentation, line breaks, and spacing inconsistencies in tests and migration files.
- Cleanup unnecessary trailing newlines and reorganize `__all__` declarations for consistency.

backend/tests/api/test_permissions_security.py

@@ -11,9 +11,9 @@ These tests prevent unauthorized access and privilege escalation.
 import pytest
 from httpx import AsyncClient
 
-from app.repositories.user import user_repo as user_crud
 from app.models.organization import Organization
 from app.models.user import User
+from app.repositories.user import user_repo as user_crud
 
 
 class TestInactiveUserBlocking: