Implement invalidate_episode method for cache management

6.0 - fixes and improvements

6.0 - refactor: parallel ffprobe, safe config parser, smart cache, version comparison fix, make_folders fix

v4.0 - fixes: ffmpeg returncode, cache path, CMD suppression, settings persistence, full English translation

Initial release v4.0

AniChapters v4.0 update

Add dist and build directories to .gitignore

Add shared chapters database system (Supabase + local cache)

Add Contributor Covenant Code of Conduct

Create CONTRIBUTING.md with contribution guidelines

Revise security policy and reporting instructions

Update issue templates

Implement update checker for GitHub releases

Revise README for improved clarity and detail

Change window title from 'Anime Chapters Generator v9.0' to 'AniChapters'