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/.gitignore

@@ -0,0 +1,30 @@
+# Temporary files created in repository root during build process 
+/Makefile
+/Makefile.old
+/Build
+/Build.bat
+/META.*
+/MYMETA.*
+
+*.mo
+.build/
+_build/
+cover_db/
+blib/
+inc/
+.lwpcookies
+.last_cover_stats
+nytprof.out
+pod2htm*.tmp
+pm_to_blib
+Zonemaster-*
+Zonemaster-*.tar.gz
+
+# Backup files from editor, by unknown and Emacs, respectively
+*.bak
+*~
+.*.swp
+
+# Unknown
+dev.pl
+bug.pl