refactor(tests): replace crud references with repo across repository test files

- Updated import statements and test logic to align with `repositories` naming changes.
- Adjusted documentation and test names for consistency with the updated naming convention.
- Improved test descriptions to reflect the repository-based structure.

backend/tests/api/test_user_routes.py

@@ -157,7 +157,7 @@ class TestListUsers:
         response = await client.get("/api/v1/users")
         assert response.status_code == status.HTTP_401_UNAUTHORIZED
 
-    # Note: Removed test_list_users_unexpected_error because mocking at CRUD level
+    # Note: Removed test_list_users_unexpected_error because mocking at repository level
     # causes the exception to be raised before FastAPI can handle it properly