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-backend/zonemaster_launch

@@ -0,0 +1,44 @@
+#!/bin/sh
+
+
+case $1 in
+
+  cli)
+	shift 1
+	zonemaster-cli $@
+    ;;
+
+  zmb)
+	shift 1
+	zmb $@
+    ;;
+
+  zmtest)
+	shift 1
+	zmtest $@
+    ;;
+
+  rpcapi)
+	/usr/local/bin/starman --listen=0.0.0.0:5000 --preload-app --user=zonemaster --group=zonemaster /usr/local/bin/zonemaster_backend_rpcapi.psgi
+
+    ;;
+
+  testagent)
+	/usr/local/bin/zonemaster_backend_testagent -user=zonemaster --group=zonemaster foreground
+    ;;
+
+  full)
+        exec /init
+    ;;
+  *)
+    echo "'$1' is not a valid option.
+    Available options:
+	- cli       : pass argument to zonemaster-cli then quit
+	- full      : start both rpcapi & testagent
+	- rpcapi
+	- testagent
+	- zmb
+	- zmtest
+    "
+    ;;
+esac;