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/admin.py

@@ -2,18 +2,27 @@ from django.contrib import admin
 from django.utils.html import format_html
 from .models import Photo
 
+
 @admin.register(Photo)
 class PhotoAdmin(admin.ModelAdmin):
-    list_display = ('thumbnail_preview', 'content_type', 'content_object', 'caption', 'is_primary', 'created_at')
-    list_filter = ('content_type', 'is_primary', 'created_at')
-    search_fields = ('caption', 'alt_text')
-    readonly_fields = ('thumbnail_preview',)
-    
+    list_display = (
+        "thumbnail_preview",
+        "content_type",
+        "content_object",
+        "caption",
+        "is_primary",
+        "created_at",
+    )
+    list_filter = ("content_type", "is_primary", "created_at")
+    search_fields = ("caption", "alt_text")
+    readonly_fields = ("thumbnail_preview",)
+
     def thumbnail_preview(self, obj):
         if obj.image:
             return format_html(
                 '<img src="{}" style="max-height: 50px; max-width: 100px;" />',
-                obj.image.url
+                obj.image.url,
             )
         return "No image"
-    thumbnail_preview.short_description = 'Thumbnail'
+
+    thumbnail_preview.short_description = "Thumbnail"