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/share/Makefile

@@ -0,0 +1,15 @@
+# This is a wrapper for BSD Make (FreeBSD) to execute
+# GNU Make (gmake) and the primary makefile GNUmakefile.
+
+GNUMAKE ?= gmake
+FILES != ls *
+
+# File targets should be evaluated by gmake.
+.PHONY: all $(FILES)
+
+all:
+	@${GNUMAKE} $@
+
+.DEFAULT:
+	@${GNUMAKE} $@
+