Introduces environment variable support for specifying yt-dlp cookies via file path or direct content for the media download command. Updates error handling to provide clearer messages when cookies are required and ensures temporary cookie files are cleaned up. Also updates .env.example and .gitignore to reflect these changes.
Introduced a new 'media' command group with a 'download' subcommand for downloading videos via yt-dlp. Updated help and README to include the new media category and command. Added yt-dlp to requirements.txt.
