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/Dockerfile

@@ -0,0 +1,37 @@
+FROM zonemaster/engine:local AS build
+
+RUN apk add --no-cache \
+    make \
+    perl-app-cpanminus \
+    perl-json-xs \
+    perl-lwp-protocol-https \
+    perl-mojolicious \
+    perl-test-deep \
+    perl-test-differences \
+    perl-try-tiny \
+ && cpanm --notest --no-wget --from https://cpan.metacpan.org/ \
+    JSON::Validator
+
+ARG version
+
+COPY ./Zonemaster-CLI-${version}.tar.gz ./Zonemaster-CLI-${version}.tar.gz
+
+RUN cpanm --notest --no-wget \
+    ./Zonemaster-CLI-${version}.tar.gz
+
+FROM zonemaster/engine:local
+
+RUN apk add --no-cache \
+    perl-json-xs \
+    perl-try-tiny
+
+COPY --from=build /usr/local/bin/zonemaster-cli /usr/local/bin/zonemaster-cli
+# Include all the Perl modules we built
+COPY --from=build /usr/local/lib/perl5/site_perl /usr/local/lib/perl5/site_perl
+COPY --from=build /usr/local/share/perl5/site_perl /usr/local/share/perl5/site_perl
+
+USER nobody:nogroup
+
+ENTRYPOINT [ "zonemaster-cli" ]
+
+CMD [ "--help" ]