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/share/zm-rpcapi.lsb

@@ -0,0 +1,73 @@
+#!/bin/sh
+#
+### BEGIN INIT INFO
+# Provides:          zm-rpcapi
+# Required-Start:    $network $local_fs
+# Required-Stop:     $network $local_fs
+# Should-Start:      mysql postgresql
+# Should-Stop:       mysql postgresql
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: A JSON-RPC frontend for Zonemaster Backend
+# Description:       zm-rpcapi lets you add new tests and check for results in
+#                    the the Zonemaster Backend database
+### END INIT INFO
+
+BINDIR=${ZM_BACKEND_BINDIR:-/usr/local/bin}
+LOGFILE=${ZM_BACKEND_LOGFILE:-/var/log/zonemaster/zm-rpcapi.log}
+PIDFILE=${ZM_BACKEND_PIDFILE:-/var/run/zonemaster/zm-rpcapi.pid}
+LISTENIP=${ZM_BACKEND_LISTENIP:-127.0.0.1}
+LISTENPORT=${ZM_BACKEND_LISTENPORT:-5000}
+USER=${ZM_BACKEND_USER:-zonemaster}
+GROUP=${ZM_BACKEND_GROUP:-zonemaster}
+
+STARMAN=`PATH="$PATH:/usr/local/bin" /usr/bin/which starman`
+#export ZM_BACKEND_RPCAPI_LOGLEVEL='warning'  # Set this variable to override the default log level
+
+. /lib/lsb/init-functions
+
+start () {
+    $STARMAN --listen=$LISTENIP:$LISTENPORT --preload-app --user=$USER --group=$GROUP --pid=$PIDFILE --error-log=$LOGFILE --daemonize $BINDIR/zonemaster_backend_rpcapi.psgi || exit 1
+}
+
+stop () {
+    if [ -f $PIDFILE ]
+    then
+        kill `cat $PIDFILE`
+    fi
+}
+
+status () {
+    status="0"
+    pidofproc -p "$PIDFILE" starman >/dev/null || status="$?"
+    if [ "$status" = 0 ]; then
+        log_success_msg "zm-rpcapi is running"
+        return 0
+    elif [ "$status" = 4 ]; then
+        log_failure_msg "could not access PID file for zm-rpcapi"
+        return $status
+    else
+        log_failure_msg "zm-rpcapi is not running"
+        return $status
+    fi
+}
+
+case "$1" in
+    start)
+        start
+        ;;
+    stop)
+        stop
+        ;;
+    restart|force-reload)
+        stop
+        start
+        ;;
+    status)
+        status
+        ;;
+    *)
+        echo "usage: $0 [start|stop|restart|force-reload|status]"
+        exit 1
+esac
+exit 0