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/productivity/main.yml

@@ -13,9 +13,6 @@
   import_tasks: syncthing.yml
   tags: syncthing
 
-- name: Install mmdl
-  import_tasks: mmdl.yml
-  tags: mmdl
 
 - name: Install heyform
   import_tasks: heyform.yml
@@ -25,22 +22,12 @@
   import_tasks: dawarich.yml
   tags: dawarich
 
-- name: Install palmr
-  import_tasks: palmr.yml
-  tags: palmr
 
 - name: Install obsidian-livesync
   import_tasks: obsidian-livesync.yml
   tags: obsidian-livesync
 
-- name: Install kanboard
-  import_tasks: kanboard.yml
-  tags: kanboard
 
 - name: Install gokapi
   import_tasks: gokapi.yml
   tags: gokapi
-
-- name: Install grocy
-  import_tasks: grocy.yml
-  tags: grocy