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-gui/package.json

@@ -0,0 +1,43 @@
+{
+    "name": "zonemaster-gui",
+    "version": "v5.0.1",
+    "license": "BSD-2-Clause",
+    "scripts": {
+        "start": "npm run dev",
+        "dev": "astro dev",
+        "build": "astro build",
+        "release": "npm run build && node scripts/create_release.js",
+        "preview": "astro preview",
+        "astro": "astro",
+        "lib:build": "cd src/lib && vite build -c ./vite.config.js --outDir ../../dist --emptyOutDir",
+        "lib:demo": "vite serve demo -c src/lib/vite.config.js",
+        "e2e": "playwright --version && playwright test",
+        "e2e:update": "playwright --version && playwright test --update-snapshots",
+        "e2e:install": "playwright install chromium",
+        "e2e:install-deps": "playwright install-deps chromium"
+    },
+    "private": false,
+    "type": "module",
+    "dependencies": {
+        "@astrojs/node": "^9.5.1",
+        "@astrojs/svelte": "^7.2.2",
+        "astro": "^5.16.4",
+        "punycode": "^2.3.1",
+        "remark-definition-list": "^2.0.0",
+        "remark-gfm": "^4.0.1",
+        "svelte": "^5.45.6"
+    },
+    "devDependencies": {
+        "@playwright/test": "^1.57.0",
+        "@sveltejs/vite-plugin-svelte": "^6.2.1",
+        "@tsconfig/svelte": "^5.0.6",
+        "@types/node": "^24.10.1",
+        "archiver": "^7.0.1",
+        "prettier": "3.7.4",
+        "prettier-plugin-astro": "0.14.1",
+        "prettier-plugin-svelte": "^3.4.0",
+        "svelte-check": "^4.3.4",
+        "typescript": "^5.9.3",
+        "vite": "^7.2.7"
+    }
+}