feat: add dockcheck update labels and fix Gotify service names

- Add mag37.dockcheck.update labels to audiobookshelf, caddy, gitea services
- Fix Gotify container names in Caddyfile routing
- Add explicit container names for gotify and igotify-assistant services
- Update Authentik to version 2025.6.3
- Fix environment variable format in gotify-compose template

🤖 Generated with [Claude Code](https://claude.ai/code)

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

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

@@ -16,6 +16,7 @@ services:
       glance.icon: si:audiobookshelf
       glance.url: https://{{ subdomains.audio }}/
       glance.description: Audio book server
+      mag37.dockcheck.update: true
 volumes:
   audiobooks:
     driver: local