surfaced it as "Failed to get image", which Bambuddy reported back as a 400.
Fix: the snapshot endpoint already accepts a reusable camera-stream token (the same mechanism used by <img>-based camera consumers, since browsers can't send auth headers
on image loads). The detection service now appends that token to the URL it gives the ML API. The token is cached on the service, refreshed 5 min before its 60-min expiry,
and is simply ignored when Bambuddy auth is disabled — so no behavior change for users without auth.
Refs #172