**Replace Flake8 with Ruff, refactor type hints, and enhance archive processing logic**

- Removed `flake8` and `flake8-annotations` from dependencies, replaced by `ruff` for linting.
- Introduced cleaner type hinting and modern Python annotations (PEP 604 style) across multiple modules.
- Moved archive processing to a dedicated helper (`comic.archives`) for improved maintainability.
- Updated and simplified logic for archive file retrieval, directory cleaning, and user access validation.
- Improved error handling and added support for user classification restrictions in API responses.

cbreader/urls.py

@@ -23,10 +23,11 @@ from drf_yasg import openapi
 from drf_yasg.views import get_schema_view
 from rest_framework import permissions
 from rest_framework.routers import DefaultRouter
-# from rest_framework_extensions.routers import ExtendedDefaultRouter
-from rest_framework_simplejwt.views import TokenObtainPairView, TokenRefreshView, TokenBlacklistView
 
-from comic import rest, feeds
+# from rest_framework_extensions.routers import ExtendedDefaultRouter
+from rest_framework_simplejwt.views import TokenBlacklistView, TokenObtainPairView, TokenRefreshView
+
+from comic import feeds, rest
 
 schema_view = get_schema_view(
     openapi.Info(