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/docs/internal/functional-tests/Behavior-TP/behavior04.md

@@ -0,0 +1,21 @@
+## BEHAVIOR04: Able to test a particular profile from the CLI using an option which selects a particular test profile
+
+### Test case identifier
+
+**BEHAVIOR04:** Able to test a particular profile from the CLI using an option
+which selects a particular test profile
+
+### Objective 
+Zonecheck CLI has an option '-P' which allows to select a particular profile to
+test. For example, "zonecheck -P Afnic iis.se" tests the zone with the tests
+defined in afnic.profile
+(https://github.com/mat813/ZoneCheck/blob/master/etc/zonecheck/afnic.profile). 
+
+### Results
+The Zonemaster-CLI has integrated this functionality even though
+as of not we do not have different profiles to test.
+
+
+
+
+