**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

@@ -58,7 +58,7 @@ router.register(r'initial_setup', rest.InitialSetup, basename='initial_setup')
 urlpatterns = [
     path('admin/', admin.site.urls),
     path("feed/<user_selector>/", feeds.RecentComicsAPI()),
-    re_path(r'^swagger(?P<format>\.json|\.yaml)$', schema_view.without_ui(cache_timeout=0), name='schema-json'),
+    re_path(r'^swagger\.(?P<format>json|yaml)$', schema_view.without_ui(cache_timeout=0), name='schema-json'),
     re_path(r'^swagger/$', schema_view.with_ui('swagger', cache_timeout=0), name='schema-swagger-ui'),
     re_path(r'^redoc/$', schema_view.with_ui('redoc', cache_timeout=0), name='schema-redoc'),
     path('api/token/', TokenObtainPairView.as_view(), name='token_obtain_pair'),