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-cli/MANIFEST

@@ -0,0 +1,40 @@
+Changes
+CONTRIBUTING.md
+inc/Module/Install.pm
+inc/Module/Install/Base.pm
+inc/Module/Install/Can.pm
+inc/Module/Install/External.pm
+inc/Module/Install/Fetch.pm
+inc/Module/Install/Makefile.pm
+inc/Module/Install/Metadata.pm
+inc/Module/Install/Scripts.pm
+inc/Module/Install/Share.pm
+inc/Module/Install/Win32.pm
+inc/Module/Install/WriteAll.pm
+lib/Zonemaster/CLI.pm
+lib/Zonemaster/CLI/TestCaseSet.pm
+LICENSE
+Makefile.PL
+MANIFEST			This list of files
+META.yml
+README.md
+script/zonemaster-cli
+share/GNUmakefile
+share/Makefile
+share/locale/da/LC_MESSAGES/Zonemaster-CLI.mo
+share/locale/es/LC_MESSAGES/Zonemaster-CLI.mo
+share/locale/fi/LC_MESSAGES/Zonemaster-CLI.mo
+share/locale/fr/LC_MESSAGES/Zonemaster-CLI.mo
+share/locale/nb/LC_MESSAGES/Zonemaster-CLI.mo
+share/locale/sl/LC_MESSAGES/Zonemaster-CLI.mo
+share/locale/sv/LC_MESSAGES/Zonemaster-CLI.mo
+t/00-load.t
+t/pod.t
+t/test_case_set.t
+t/usage.fake-data.data
+t/usage.fake-root.data
+t/usage.hints
+t/usage.normal.data
+t/usage.profile
+t/usage.t
+t/usage.wrapper.pl