fix(lint): resolve ruff errors in tests and run_tests.py

- Fix import sorting (I001)
- Remove unused imports and variables (F401, F841)
- Add noqa for test code (S106 hardcoded passwords, S314 XML parsing)
- Auto-format with ruff format

tests/apps/core/test_services.py

@@ -21,7 +21,7 @@ class BaseServiceTest(TestCase):
         self.user = User.objects.create_user(
             username="testuser",
             email="test@example.com",
-            password="testpass123",
+            password="testpass123",  # noqa: S106
         )
 
     def test_get_by_id_success(self):
@@ -53,7 +53,7 @@ class BaseServiceTest(TestCase):
         User.objects.create_user(
             username="testuser2",
             email="test2@example.com",
-            password="testpass123",
+            password="testpass123",  # noqa: S106
         )
 
         result = UserTestService.get_all()