Upload media securely
Upload a media file and receive a short-lived token that can be passed to
downstream endpoints (such as `/detect` and `/intelligence`) in place of a
public URL. The returned token is a JWT that expires 1 hour after issuance.
Keeping uploads private avoids exposing source media on the open internet and
means you do not need to host files yourself for jobs that only need the API
to read them once.
