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.

accounts/mixins.py

@@ -2,11 +2,13 @@ import requests
 from django.conf import settings
 from django.core.exceptions import ValidationError
 
+
 class TurnstileMixin:
     """
     Mixin to handle Cloudflare Turnstile validation.
     Bypasses validation when DEBUG is True.
     """
+
     def validate_turnstile(self, request):
         """
         Validate the Turnstile response token.
@@ -14,20 +16,20 @@ class TurnstileMixin:
         """
         if settings.DEBUG:
             return
-            
-        token = request.POST.get('cf-turnstile-response')
+
+        token = request.POST.get("cf-turnstile-response")
         if not token:
-            raise ValidationError('Please complete the Turnstile challenge.')
+            raise ValidationError("Please complete the Turnstile challenge.")
 
         # Verify the token with Cloudflare
         data = {
-            'secret': settings.TURNSTILE_SECRET_KEY,
-            'response': token,
-            'remoteip': request.META.get('REMOTE_ADDR'),
+            "secret": settings.TURNSTILE_SECRET_KEY,
+            "response": token,
+            "remoteip": request.META.get("REMOTE_ADDR"),
         }
 
         response = requests.post(settings.TURNSTILE_VERIFY_URL, data=data, timeout=60)
         result = response.json()
 
-        if not result.get('success'):
-            raise ValidationError('Turnstile validation failed. Please try again.')
+        if not result.get("success"):
+            raise ValidationError("Turnstile validation failed. Please try again.")