fix(compose): persist Surya + HF caches so rebuilds don't redownload models

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>

docker-compose.yml

@@ -24,8 +24,17 @@ services:
             - driver: nvidia
               count: 1
               capabilities: [gpu]
+    volumes:
+      # Persist Surya (datalab) + HuggingFace model caches so rebuilds don't
+      # re-download ~1.5 GB of weights every time.
+      - ix_surya_cache:/root/.cache/datalab
+      - ix_hf_cache:/root/.cache/huggingface
     labels:
       infrastructure.web_url: "http://192.168.68.42:8994"
       backup.enable: "true"
       backup.type: "postgres"
       backup.name: "infoxtractor"
+
+volumes:
+  ix_surya_cache:
+  ix_hf_cache: