Prepares audio to fit WhatsApp's 16 MB limit by recompressing it or splitting it at pauses. It returns the files and does not send anything to WhatsApp. Input: one file with a public HTTPS download_url. Optional outputFormat (for example mp3, wav, m4a) and bitrateKbps where the tool supports them. Returns download links for the result, which expire after 1 hour. The server downloads the file from download_url, keeps it in ihateaudio's Cloudflare R2 storage while the job runs, and processes it with the ihateaudio.com tool page in a headless browser on Cloudflare. The input is deleted when the job ends.