First /healthz call on a fresh container triggers Surya to fetch the
text-recognition (1.34 GB) and detection (73 MB) models from HuggingFace.
Without a volume they land in the container fs and vanish on every
rebuild, which is every deploy.
Mount named volumes for /root/.cache/datalab (Surya) and
/root/.cache/huggingface. Rebuild now keeps /healthz warm.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>