**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/tests/test_urls.py

@@ -0,0 +1,14 @@
+"""Tests for URL resolution that depends on settings."""
+
+import pytest
+from django.test import Client
+
+
+@pytest.mark.parametrize('url', ['/swagger.json', '/swagger.yaml', '/swagger/', '/redoc/'])
+def test_schema_urls_resolve(client: Client, url: str) -> None:
+    """The schema URLs must match the renderer formats, which no longer include a dot.
+
+    cbreader/urls.py captures the format after the dot because
+    SWAGGER_USE_COMPAT_RENDERERS is False.
+    """
+    assert client.get(url).status_code == 200