dircleaner

feat: Add Main10 profile and adjust quality parameter for HEVC video transcoding.

feat: add `preserve` and `min-size` flags with size parsing to transcode, enhance `ffmpeg` arguments, improve success output, and update `.gitignore`.

feat: Add concurrent transcoding with progress bar and refactor file discovery and processing

feat: add `transcode` command to convert large MP4 files to H.265 and update Go version.

harvest: add clean option to remove empty directories after harvesting