fix: FileBrowser reads stale config on fresh deployments

The gtstef/filebrowser image bakes FILEBROWSER_CONFIG=/home/filebrowser/data/config.yaml,
but controller mounts config at /home/filebrowser/config.yaml. Override the env var in both
generateFileBrowserCompose() and docker-setup.sh so FileBrowser reads the controller-managed
config with proper sources and database path.

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

scripts/docker-setup.sh

@@ -1304,6 +1304,7 @@ services:
     restart: unless-stopped
     environment:
       - TZ=Europe/Budapest
+      - FILEBROWSER_CONFIG=/home/filebrowser/config.yaml
     volumes:
       - filebrowser_data:/home/filebrowser/data
       - ./config.yaml:/home/filebrowser/config.yaml:ro