**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/admin.py

@@ -1,7 +1,6 @@
-# -*- coding: utf-8 -*-
 from django.contrib import admin
 
-from .models import Directory, ComicBook, ComicStatus, UserMisc
+from .models import ComicBook, ComicStatus, Directory, UserMisc
 
 
 @admin.register(Directory)