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/tasks/media/main.yml

@@ -9,17 +9,8 @@
   import_tasks: calibre.yml
   tags: calibre
 
-- name: Install ghost-1
-  import_tasks: ghost-1.yml
-  tags: ghost-1
 
-- name: Install pinchflat
-  import_tasks: pinchflat.yml
-  tags: pinchflat
 
-- name: Install pinry
-  import_tasks: pinry.yml
-  tags: pinry
 
 - name: Install karakeep
   import_tasks: hoarder.yml
@@ -37,4 +28,4 @@
 
 - name: Install koreader sync server
   import_tasks: kosync.yml
-  tags: kosync
+  tags: kosync