feat: add Grocy kitchen ERP service

- Add grocy subdomain to domains.yml
- Create Docker Compose template using LinuxServer image
- Add Ansible task for service deployment
- Configure Caddy reverse proxy with Authentik auth and API bypass
- Add DNS record for grocy subdomain
- Integrate with productivity services category

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

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

dns.yml

@@ -55,6 +55,8 @@
             ip: "152.53.36.98"
           - name: kanboard
             ip: "152.53.36.98"
+          - name: grocy
+            ip: "152.53.36.98"
       - name: nerder.land
         dns_records:
           - name: "forms"