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/regenerate_avatars.py

@@ -1,11 +1,18 @@
 from django.core.management.base import BaseCommand
 from accounts.models import UserProfile
 
+
 class Command(BaseCommand):
-    help = 'Regenerate default avatars for users without an uploaded avatar'
+    help = "Regenerate default avatars for users without an uploaded avatar"
 
     def handle(self, *args, **kwargs):
-        profiles = UserProfile.objects.filter(avatar='')
+        profiles = UserProfile.objects.filter(avatar="")
         for profile in profiles:
-            profile.save()  # This will trigger the avatar generation logic in the save method
-            self.stdout.write(self.style.SUCCESS(f"Regenerated avatar for {profile.user.username}"))
+            # This will trigger the avatar generation logic in the save method
+            profile.save()
+            self.stdout.write(
+                self.style.SUCCESS(
+                    f"Regenerated avatar for {
+                        profile.user.username}"
+                )
+            )