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/areas.py

@@ -1,18 +1,17 @@
 from django.db import models
-from django.urls import reverse
 from django.utils.text import slugify
-from typing import Tuple, Any
 import pghistory
 
 from core.history import TrackedModel
 from .parks import Park
 
+
 @pghistory.track()
 class ParkArea(TrackedModel):
-    
+
     # Import managers
     from ..managers import ParkAreaManager
-    
+
     objects = ParkAreaManager()
     id: int  # Type hint for Django's automatic id field
     park = models.ForeignKey(Park, on_delete=models.CASCADE, related_name="areas")
@@ -31,4 +30,4 @@ class ParkArea(TrackedModel):
         return self.name
 
     class Meta:
-        unique_together = ('park', 'slug')
+        unique_together = ("park", "slug")