**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.

comic/feeds.py

@@ -1,10 +1,10 @@
 from django.contrib.auth.models import User
 from django.contrib.syndication.views import Feed
-from django.db.models import Case, When, PositiveSmallIntegerField, F, QuerySet
+from django.db.models import Case, F, PositiveSmallIntegerField, QuerySet, When
 from django.http import HttpRequest
 from django.shortcuts import get_object_or_404
 
-from comic.models import ComicBook, UserMisc, Directory
+from comic.models import ComicBook, Directory, UserMisc
 
 
 class RecentComicsAPI(Feed):