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/config.ts

@@ -0,0 +1,23 @@
+import type { Config } from '@/types.ts';
+import packageJson from './package.json';
+
+const config: Config = {
+    defaultLanguage: 'es',
+    enabledLanguages: ['da', 'en', 'es', 'fi', 'fr', 'nb', 'sv', 'sl'],
+    baseUrl: import.meta.env.PUBLIC_BASE_URL || '/',
+    apiBaseUrl: import.meta.env.PUBLIC_API_URL || '/api',
+    pollingInterval: import.meta.env.PUBLIC_POLLING_INTERVAL || 5000,
+    clientInfo: {
+        version: packageJson.version,
+        id: 'Zonemaster-GUI',
+    },
+    siteInfo: {
+        email: 'contact@zonemaster.net',
+        siteName: '',
+    },
+    setTitle(title: string) {
+        return `${title} – Zonemaster`;
+    }
+};
+
+export default config;