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/test-zone-data/Address-TP/address01/address01.cfg

@@ -0,0 +1,10 @@
+# address01.xa
+address01.xa:53 {
+    bind 127.11.1.21                # ns1
+    bind fda1:b2:c3:0:127:11:1:21   # ns1
+    bind 127.11.1.22                # ns2
+    bind fda1:b2:c3:0:127:11:1:22   # ns2
+    log
+    file Address-TP/address01/address01.xa.zone address01.xa
+}
+