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-ldns/.github/workflows/ci.yml

@@ -0,0 +1,54 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - develop
+      - master
+      - 'release/**'
+
+  pull_request:
+    branches:
+      - develop
+      - master
+      - 'release/**'
+
+env:
+  TEST_WITH_NETWORK: 1
+
+jobs:
+  run-tests:
+    strategy:
+      fail-fast: false 
+      matrix:
+        perl:
+          - '5.40'
+          - '5.36'
+          - '5.26'
+        runner:
+          - ubuntu-22.04
+
+    runs-on: ${{ matrix.runner }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shogo82148/actions-setup-perl@v1
+        with:
+          perl-version: ${{ matrix.perl }}
+
+      - name: perl version
+        run: perl -v
+
+      - name: apt install
+        run: sudo apt install -y libidn2-dev
+
+      - name: cpan module
+        run: cpanm Devel::CheckLib ExtUtils::PkgConfig Module::Install Module::Install::XSUtil Test::Exception Test::Fatal 
+
+      - name: installation
+        run: cpanm --verbose --notest --configure-args="--no-ed25519" .
+
+      - name: test
+        run: prove -bl
+