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/management/commands/check_social_apps.py

@@ -1,19 +1,27 @@
 from django.core.management.base import BaseCommand
 from allauth.socialaccount.models import SocialApp
 
+
 class Command(BaseCommand):
-    help = 'Check social app configurations'
+    help = "Check social app configurations"
 
     def handle(self, *args, **options):
         social_apps = SocialApp.objects.all()
-        
+
         if not social_apps:
-            self.stdout.write(self.style.ERROR('No social apps found'))
+            self.stdout.write(self.style.ERROR("No social apps found"))
             return
-        
+
         for app in social_apps:
-            self.stdout.write(self.style.SUCCESS(f'\nProvider: {app.provider}'))
-            self.stdout.write(f'Name: {app.name}')
-            self.stdout.write(f'Client ID: {app.client_id}')
-            self.stdout.write(f'Secret: {app.secret}')
-            self.stdout.write(f'Sites: {", ".join(str(site.domain) for site in app.sites.all())}')
+            self.stdout.write(
+                self.style.SUCCESS(
+                    f"\nProvider: {
+                        app.provider}"
+                )
+            )
+            self.stdout.write(f"Name: {app.name}")
+            self.stdout.write(f"Client ID: {app.client_id}")
+            self.stdout.write(f"Secret: {app.secret}")
+            self.stdout.write(
+                f'Sites: {", ".join(str(site.domain) for site in app.sites.all())}'
+            )