Refactor test utilities and enhance ASGI settings

- Cleaned up and standardized assertions in ApiTestMixin for API response validation.
- Updated ASGI settings to use os.environ for setting the DJANGO_SETTINGS_MODULE.
- Removed unused imports and improved formatting in settings.py.
- Refactored URL patterns in urls.py for better readability and organization.
- Enhanced view functions in views.py for consistency and clarity.
- Added .flake8 configuration for linting and style enforcement.
- Introduced type stubs for django-environ to improve type checking with Pylance.

parks/models/__init__.py

@@ -1,5 +1,31 @@
-from .location import *
-from .areas import *
-from .parks import *
-from .reviews import *
-from .companies import *
+"""
+Parks app models with clean import interface.
+
+This module provides a clean import interface for all parks-related models,
+enabling imports like: from parks.models import Park, Operator
+
+The Company model is aliased as Operator to clarify its role as park operators,
+while maintaining backward compatibility through the Company alias.
+"""
+
+from .parks import Park
+from .areas import ParkArea
+from .location import ParkLocation
+from .reviews import ParkReview
+from .companies import Company, CompanyHeadquarters
+
+# Alias Company as Operator for clarity
+Operator = Company
+
+__all__ = [
+    # Primary models
+    "Park",
+    "ParkArea",
+    "ParkLocation",
+    "ParkReview",
+    # Company models with clear naming
+    "Operator",
+    "CompanyHeadquarters",
+    # Backward compatibility
+    "Company",  # Alias to Operator
+]