Harden permissions, close exposed ports, and clean up tasks

- Quote file modes. Unquoted 644/755 were read as decimal, so files
  landed as 1204. Templates holding secrets are now 0640 root:docker.
- Stop publishing Authentik 9000/9443 and Karakeep 3000 (Caddy reaches
  them over the docker network), bind dir2opds to the Tailscale IP, and
  drop Caddy's unused 8448.
- Atuin login uses no_log and only runs once; the installer only runs
  when Atuin is missing.
- Make chsh, ufw-docker install, the bat symlink and Atuin dotfiles
  idempotent.
- Back up the Paperless data volume (SQLite DB), stopping Paperless
  during the backup.
- Close public sign-up on kosync and ByteStash.
- Replace hardcoded IPs and domains with variables.
- Remove teardown tasks and templates for 9 retired services.
- Fix the dockcheck comment: it auto-updates labelled containers.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

roles/docker/templates/paperlessngx-compose.yml.j2

@@ -12,6 +12,8 @@ services:
     image: ghcr.io/paperless-ngx/paperless-ngx:latest
     restart: unless-stopped
     labels:
+      # Stop during backup so the SQLite database in the data volume is consistent
+      docker-volume-backup.stop-during-backup: true
       glance.name: Paperless NGX
       glance.icon: si:paperlessngx
       glance.url: https://{{ subdomains.paper }}/
@@ -75,6 +77,7 @@ services:
       AWS_SECRET_ACCESS_KEY: {{ vault_backup.secret_access_key }}
     volumes:
       - media:/backup/pngx-app-backup:ro
+      - data:/backup/pngx-data-backup:ro
       - /var/run/docker.sock:/var/run/docker.sock:ro
 
 volumes: