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/test-zone-data/Basic-TP/basic01/parent.COMMON.basic01.xa.zone

@@ -0,0 +1,32 @@
+; Shared zone files for granparent zones when "parent"
+; is to be delegated in the standard way or overwridden
+; in basic01.cfg file.
+;
+; * All names must be relative here.
+; * $ORIGIN is inherited from the loading of the zone
+
+$TTL 3600
+
+@       SOA     ns1 admin. (
+                2024051900      ; serial
+                6h              ; refresh
+                1h              ; retry
+                1w              ; expire
+                1d )            ; minimum
+                
+
+@		NS	ns1
+@		NS	ns2
+ns1		A	127.12.1.41
+ns1		AAAA	fda1:b2:c3:0:127:12:1:41
+ns2		A	127.12.1.42
+ns2		AAAA	fda1:b2:c3:0:127:12:1:42
+
+
+$ORIGIN child             ; Must not end with "."
+
+@		NS	ns1-delegated-child.basic01.xa.  ; Dummy server
+@		NS	ns2-delegated-child.basic01.xa.  ; Dummy server
+
+
+