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/cleanup_social_auth.py

@@ -1,8 +1,9 @@
 from django.core.management.base import BaseCommand
 from django.db import connection
 
+
 class Command(BaseCommand):
-    help = 'Clean up social auth tables and migrations'
+    help = "Clean up social auth tables and migrations"
 
     def handle(self, *args, **options):
         with connection.cursor() as cursor:
@@ -11,12 +12,17 @@ class Command(BaseCommand):
             cursor.execute("DROP TABLE IF EXISTS socialaccount_socialapp_sites")
             cursor.execute("DROP TABLE IF EXISTS socialaccount_socialaccount")
             cursor.execute("DROP TABLE IF EXISTS socialaccount_socialtoken")
-            
+
             # Remove migration records
             cursor.execute("DELETE FROM django_migrations WHERE app='socialaccount'")
-            cursor.execute("DELETE FROM django_migrations WHERE app='accounts' AND name LIKE '%social%'")
-            
+            cursor.execute(
+                "DELETE FROM django_migrations WHERE app='accounts' "
+                "AND name LIKE '%social%'"
+            )
+
             # Reset sequences
             cursor.execute("DELETE FROM sqlite_sequence WHERE name LIKE '%social%'")
-            
-            self.stdout.write(self.style.SUCCESS('Successfully cleaned up social auth configuration'))
+
+            self.stdout.write(
+                self.style.SUCCESS("Successfully cleaned up social auth configuration")
+            )