**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/settings/base.py

@@ -247,6 +247,10 @@ SIMPLE_JWT = {
     'ISSUER': 'cbwebreader',
 }
 
+# Renderer formats no longer include a leading dot, so the URL pattern in
+# cbreader/urls.py matches the dot separately. See cbreader/urls.py.
+SWAGGER_USE_COMPAT_RENDERERS = False
+
 FRONTEND_DIR = os.path.join(BASE_DIR, 'frontend')
 
 TEMPLATES = [