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/Delegation-TP/delegation03/delegation03.cfg

@@ -0,0 +1,42 @@
+## root
+.:53 {
+    bind 127.16.3.27               # ns1
+    bind fda1:b2:c3:0:127:16:3:27  # ns1
+    bind 127.16.3.28               # ns2
+    bind fda1:b2:c3:0:127:16:3:28  # ns2
+    log
+    file Delegation-TP/delegation03/root-zone.zone .
+}
+
+# Resolver using test case local root
+. {
+    bind 127.16.3.53
+    unbound {
+       option root-hints Delegation-TP/delegation03/hintfile.zone
+    }
+    log
+}
+
+delegation03.xa:53 { # xa
+    bind 127.16.3.21               # ns1
+    bind fda1:b2:c3:0:127:16:3:21  # ns1
+    bind 127.16.3.22               # ns2
+    bind fda1:b2:c3:0:127:16:3:22  # ns2
+    log
+    file Delegation-TP/delegation03/delegation03.xa.zone delegation03.xa
+}
+
+localhost.xa:53 { # To make something listen to the addresses
+    bind 127.16.3.31               # ns1
+    bind fda1:b2:c3:0:127:16:3:31  # ns1
+    bind 127.16.3.32               # ns2
+    bind fda1:b2:c3:0:127:16:3:32  # ns2
+    bind 127.16.3.33               # ns3
+    bind fda1:b2:c3:0:127:16:3:33  # ns3
+    bind 127.16.3.34               # ns4
+    bind fda1:b2:c3:0:127:16:3:34  # ns4
+    bind 127.16.3.35               # ns5
+    bind fda1:b2:c3:0:127:16:3:35  # ns5
+    log
+}
+