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-engine/t/profiles/Test-nameserver-all.json

@@ -0,0 +1,18 @@
+{
+    "test_cases": [
+        "nameserver01",
+        "nameserver02",
+        "nameserver03",
+        "nameserver04",
+        "nameserver05",
+        "nameserver06",
+        "nameserver07",
+        "nameserver08",
+        "nameserver09",
+        "nameserver10",
+        "nameserver11",
+        "nameserver12",
+        "nameserver13",
+        "nameserver15"
+    ]
+}