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/generate_letter_avatars.py

@@ -2,6 +2,7 @@ from django.core.management.base import BaseCommand
 from PIL import Image, ImageDraw, ImageFont
 import os
 
+
 def generate_avatar(letter):
     """Generate an avatar for a given letter or number"""
     avatar_size = (100, 100)
@@ -10,7 +11,7 @@ def generate_avatar(letter):
     font_size = 100
 
     # Create a blank image with background color
-    image = Image.new('RGB', avatar_size, background_color)
+    image = Image.new("RGB", avatar_size, background_color)
     draw = ImageDraw.Draw(image)
 
     # Load a font
@@ -19,8 +20,14 @@ def generate_avatar(letter):
 
     # Calculate text size and position using textbbox
     text_bbox = draw.textbbox((0, 0), letter, font=font)
-    text_width, text_height = text_bbox[2] - text_bbox[0], text_bbox[3] - text_bbox[1]
-    text_position = ((avatar_size[0] - text_width) / 2, (avatar_size[1] - text_height) / 2)
+    text_width, text_height = (
+        text_bbox[2] - text_bbox[0],
+        text_bbox[3] - text_bbox[1],
+    )
+    text_position = (
+        (avatar_size[0] - text_width) / 2,
+        (avatar_size[1] - text_height) / 2,
+    )
 
     # Draw the text on the image
     draw.text(text_position, letter, font=font, fill=text_color)
@@ -34,11 +41,14 @@ def generate_avatar(letter):
     avatar_path = os.path.join(avatar_dir, f"{letter}_avatar.png")
     image.save(avatar_path)
 
+
 class Command(BaseCommand):
-    help = 'Generate avatars for letters A-Z and numbers 0-9'
+    help = "Generate avatars for letters A-Z and numbers 0-9"
 
     def handle(self, *args, **kwargs):
-        characters = [chr(i) for i in range(65, 91)] + [str(i) for i in range(10)]  # A-Z and 0-9
+        characters = [chr(i) for i in range(65, 91)] + [
+            str(i) for i in range(10)
+        ]  # A-Z and 0-9
         for char in characters:
             generate_avatar(char)
             self.stdout.write(self.style.SUCCESS(f"Generated avatar for {char}"))