ogg2mp3

Convert QQ Music .ogg/.oggh audio files on macOS to .mp3 with embedded cover art (extracted from ICNS in the macOS Resource Fork) and metadata. Provides `convert` (single file), `batch` (directory, optional recursion + skip/overwrite/dry-run), `inspect` (read-only metadata + cover probe, no conversion), and `doctor` (environment self-check). Output is plain MP3 with id3v2.3 tags. Use when the user has QQ Music downloads and wants standard MP3 with covers intact. Not for general audio transcoding — the cover extraction path is QQ Music–specific (reads macOS Resource Fork).