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.

email_service/views.py

@@ -5,6 +5,7 @@ from rest_framework.permissions import AllowAny
 from django.contrib.sites.shortcuts import get_current_site
 from .services import EmailService
 
+
 class SendEmailView(APIView):
     permission_classes = [AllowAny]  # Allow unauthenticated access
 
@@ -16,30 +17,33 @@ class SendEmailView(APIView):
         from_email = data.get("from_email")  # Optional
 
         if not all([to, subject, text]):
-            return Response({
-                "error": "Missing required fields",
-                "required_fields": ["to", "subject", "text"]
-            }, status=status.HTTP_400_BAD_REQUEST)
+            return Response(
+                {
+                    "error": "Missing required fields",
+                    "required_fields": ["to", "subject", "text"],
+                },
+                status=status.HTTP_400_BAD_REQUEST,
+            )
 
         try:
             # Get the current site
             site = get_current_site(request)
-            
+
             # Send email using the site's configuration
             response = EmailService.send_email(
                 to=to,
                 subject=subject,
                 text=text,
                 from_email=from_email,  # Will use site's default if None
-                site=site
+                site=site,
             )
-            
-            return Response({
-                "message": "Email sent successfully",
-                "response": response
-            }, status=status.HTTP_200_OK)
-            
+
+            return Response(
+                {"message": "Email sent successfully", "response": response},
+                status=status.HTTP_200_OK,
+            )
+
         except Exception as e:
-            return Response({
-                "error": str(e)
-            }, status=status.HTTP_500_INTERNAL_SERVER_ERROR)
+            return Response(
+                {"error": str(e)}, status=status.HTTP_500_INTERNAL_SERVER_ERROR
+            )