fix: make /photos writable on server so icloudpd can create download folders

Worker stays read-only; server needs write access to sync iCloud photos.

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

docker-compose.yml

@@ -17,7 +17,6 @@ services:
       - type: bind
         source: /media/Plex/Gallery
         target: /photos
-        read_only: true
     healthcheck:
       test: ["CMD", "wget", "-qO-", "http://localhost:3000/api/health"]
       interval: 30s