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/t/usage.profile

@@ -0,0 +1,20 @@
+{
+  "net":{
+    "ipv4": false,
+    "ipv6": false
+  },
+  "resolver":{
+    "source4": "192.0.2.1",
+    "source6": "2001:db8::1"
+  },
+  "test_levels" : {
+    "BASIC" : {
+      "B01_CHILD_FOUND" : "NOTICE",
+      "B01_ROOT_HAS_NO_PARENT" : "WARNING",
+      "B02_AUTH_RESPONSE_SOA" : "ERROR"
+    },
+    "SYSTEM" : {
+      "GLOBAL_VERSION" : "INFO"
+    }
+  }
+}