**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_util.py

@@ -0,0 +1,22 @@
+"""Tests for breadcrumb generation."""
+
+import pytest
+
+from comic import models
+from comic.util import generate_breadcrumbs_from_path
+
+
+@pytest.mark.django_db
+def test_breadcrumbs_run_from_home_to_the_book() -> None:
+    parent = models.Directory.objects.create(name='Series')
+    child = models.Directory.objects.create(name='Volume 1', parent=parent)
+    book = models.ComicBook.objects.create(file_name='issue.cbz', directory=child)
+    assert [crumb.name for crumb in generate_breadcrumbs_from_path(child, book)] == [
+        'Home', 'Series', 'Volume 1', 'issue.cbz',
+    ]
+
+
+@pytest.mark.django_db
+def test_breadcrumbs_without_a_book_stop_at_the_directory() -> None:
+    directory = models.Directory.objects.create(name='Series')
+    assert [crumb.name for crumb in generate_breadcrumbs_from_path(directory)] == ['Home', 'Series']