v3.0.0 - Config Dataclass & Parallel Reads

• Breaking Changes
  • get_config() now returns a ComicboxSettings dataclass, not a Confuse
    AttrDict. Comicbox constructor now accepts this dataclass instead of an
    AttrDict
• Fixes
  • Stop emitting metron.cloud/{genre,location,reprint,role,story,tag}/...
    URLs for Metron identifiers — those paths 404 because Metron has no public
    web pages for those types (only API endpoints). The numeric Metron ID is
    still preserved on the identifier.
  • Security against suspicious archive paths when extracting pages and
    metadata to the filesystem.
• Performance
  • Reducing startup time for new instances of comicbox.
  • General performance improvements for reading metadata from many files.
  • Special multiprocessing and async methods
    comicbox.process.iter_process_files() and
    comicbox.process.aread_metadata() for reading large batches of files at
    once.
  • Comicbox.get_cover_page(skip_metadata=True) skips metadata parsing for
    callers that just need the first archive image as a thumbnail. Removes
    per-call schema instantiation and Union resolution overhead.
• Features
  • Add Age Rating conversion function
    comicbox.enums.maps.to_metron_age_rating(value: str | Enum) ->
    MetronAgeRatingEnum | None