**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/util.py

@@ -1,5 +1,4 @@
 from dataclasses import dataclass
-from typing import Optional
 
 from comic.models import ComicBook, Directory
 
@@ -10,12 +9,12 @@ class Breadcrumb:
     selector: str = ''
 
 
-def generate_breadcrumbs_from_path(directory: Optional[Directory] = None, book: Optional[ComicBook] = None):
+def generate_breadcrumbs_from_path(
+        directory: Directory | None = None,
+        book: ComicBook | None = None,
+) -> list[Breadcrumb]:
     output = [Breadcrumb()]
-    if directory:
-        folders = directory.get_path_objects()
-    else:
-        folders = []
+    folders = directory.get_path_objects() if directory else []
     for item in folders[::-1]:
         output.append(
             Breadcrumb(