Normalize every submission to mono 96 kbps MP3 so takes play everywhere regardless of the recording codec; falls back to storing the original file when ffmpeg is unavailable or fails.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
