Remove /data volume mount from platesolver service

The platesolver image now stores astrometry indexes at /opt/astrometry
(not /data/astrometry), so the shared /data bind-mount was shadowing
the baked-in indexes and forcing a fresh 10 GB download on every
container start.

The platesolver is a stateless HTTP service — it doesn't read or write
anything under /data — so the volume is simply not needed.

Also adds restart: unless-stopped for consistency with other services.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: onekiloparsec

arcsecond/hosting/docker/docker-compose.yml

@@ -102,15 +102,8 @@ services:
   platesolver:
     image: ghcr.io/arcsecond-io/arcsecond-service-platesolver-astrometry:latest
     container_name: arcsecond-platesolver
+    restart: unless-stopped
     ports: [ "8900:8900" ]
-    volumes:
-      # Leave /data as is, it's a path inside the container, not in the host machine.
-      # SHARED_DATA_PATH must be a path of your host machine, specified in the .env file.
-      - type: bind
-        source: ${SHARED_DATA_PATH}
-        target: /data
-        bind:
-          create_host_path: true
 
   # Arcsecond webapp.
   web: