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.

media/apps.py

@@ -1,6 +1,7 @@
 from django.apps import AppConfig
 from django.db.models.signals import post_migrate
 
+
 def create_photo_permissions(sender, **kwargs):
     """Create custom permissions for photos"""
     from django.contrib.auth.models import Permission
@@ -9,24 +10,25 @@ def create_photo_permissions(sender, **kwargs):
 
     content_type = ContentType.objects.get_for_model(Photo)
     Permission.objects.get_or_create(
-        codename='add_photo',
-        name='Can add photo',
+        codename="add_photo",
+        name="Can add photo",
         content_type=content_type,
     )
     Permission.objects.get_or_create(
-        codename='change_photo',
-        name='Can change photo',
+        codename="change_photo",
+        name="Can change photo",
         content_type=content_type,
     )
     Permission.objects.get_or_create(
-        codename='delete_photo',
-        name='Can delete photo',
+        codename="delete_photo",
+        name="Can delete photo",
         content_type=content_type,
     )
 
+
 class MediaConfig(AppConfig):
-    default_auto_field = 'django.db.models.BigAutoField'
-    name = 'media'
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "media"
 
     def ready(self):
         post_migrate.connect(create_photo_permissions, sender=self)