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/mmdl-compose.yml.j2

@@ -35,6 +35,7 @@ services:
     labels:
       glance.parent: mmdl
       glance.name: DB
+      mag37.dockcheck.update: true
 
 volumes:
   mmdl_db: