feat: add full Zonemaster stack with Docker and Spanish UI

- Clone all 5 Zonemaster component repos (LDNS, Engine, CLI, Backend, GUI)
- Dockerfile.backend: 8-stage multi-stage build LDNS→Engine→CLI→Backend
- Dockerfile.gui: Astro static build served via nginx
- docker-compose.yml: backend (internal) + frontend (port 5353)
- nginx.conf: root redirects to /es/, /api/ proxied to backend
- zonemaster-gui/config.ts: defaultLanguage set to 'es' (Spanish)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

zonemaster/docs/contact-and-mailing-lists.md

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+# Contact and Mailing lists
+
+An [open discussion forum] can be found at Github. You are welcome to ask your
+question there or join the mailing list and ask it there.
+
+## Mailing lists
+
+The Zonemaster project offer two public mailing lists with
+different goals:
+
+* zonemaster-announce
+* zonemaster-users
+
+### zonemaster-announce
+
+The goal of `zonemaster-announce` is to provide a low-volume
+mailing list for announcements from the Zonemaster project. Mainly
+it is used to announce that a new Zonemaster release has been
+published, but also to report on severe security problems.
+
+The members of the list are not able to post any messages to the
+list. This is for one-way communication only.
+
+To sign-up on the list, go to
+https://lists.iis.se/postorius/lists/zonemaster-announce.lists.iis.se/
+
+### zonemaster-users
+
+The goal of `zonemaster-users` is to provide a forum for discussions
+between and questions from Zonemaster users. The users in this sense
+are mainly those that have installed some part of the code. That
+could either be for evaluation on a small virtual server or a
+full-fledged installation of all parts for public use or anything
+in between.
+
+The members of the Zonemaster working group are also on list and can
+reply to questions and participate in discussions.
+
+The members of the list can post messages to the list, but those
+must of course be relevant and respectful.
+
+To sign-up on the list, go to
+https://lists.iis.se/postorius/lists/zonemaster-users.lists.iis.se/
+
+## Questions on problems with a domain name
+
+If you have problem with your domain name, we can unfortunately not
+help you solving the issue. Zonemaster can hopefully point out what
+is wrong, but to have that issue resolved, you have to turn to
+your DNS operator.
+
+If Zonemaster does not report when there is a DNS error, or if
+Zonemaster falsely reports an error, then we are very interested
+to hear from you.
+
+## Contacting the Zonemaster project
+
+The best way to contact the Zonemaster project, besides using the
+mailing list, is to create an issue in the GitHub issue tracker
+for the Zonemaster repositories. That could be pure questions, but also
+bug reports or suggestions for improvements.
+
+* [Issues in Zonemaster::LDNS]
+* [Issues in Zonemaster::Engine]
+* [Issues in Zonemaster::CLI]
+* [Issues in Zonemaster::Backend]
+* [Issues in zonemaster::GUI]
+
+If you cannot determine which repository to create the issue in, please
+select the main Zonemaster repository (i.e.
+[general issues in Zonemaster][Issues in Zonemaster]).
+
+If you cannot use any of the methods above, due to the subject matter, please
+send an e-mail to zonemaster@zonemaster.net.
+
+[Issues in Zonemaster::Backend]:     https://github.com/zonemaster/zonemaster-backend/issues
+[Issues in Zonemaster::CLI]:         https://github.com/zonemaster/zonemaster-cli/issues
+[Issues in Zonemaster::Engine]:      https://github.com/zonemaster/zonemaster-engine/issues
+[Issues in Zonemaster::LDNS]:        https://github.com/zonemaster/zonemaster-ldns/issues
+[Issues in Zonemaster]:              https://github.com/zonemaster/zonemaster/issues
+[Issues in zonemaster::GUI]:         https://github.com/zonemaster/zonemaster-gui/issues
+[Open discussion forum]:             https://github.com/orgs/zonemaster/discussions