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/public/specifications/tests/Nameserver-TP/README.md

@@ -0,0 +1,30 @@
+# Name Server Test Plan
+
+These are tests of the properties of a name server.
+
+This document uses the terminology defined in the [Master Test Plan].
+
+
+[Master Test Plan]:             ../MasterTestPlan.md
+[Test Case README]:             ../README.md
+
+<!-- Content until EOF generated by script updateTestPlanReadme.pl from Zonemaster/Zonemaster utils directory -->
+
+## Test cases list
+
+|Test Case |Test Case Description|
+|:---------|:--------------------|
+|[NAMESERVER01](nameserver01.md)|A name server should not be a recursor|
+|[NAMESERVER02](nameserver02.md)|Test of EDNS0 support|
+|[NAMESERVER03](nameserver03.md)|Test availability of zone transfer (AXFR)|
+|[NAMESERVER04](nameserver04.md)|Same source address|
+|[NAMESERVER05](nameserver05.md)|Behaviour against AAAA query|
+|[NAMESERVER06](nameserver06.md)|NS can be resolved|
+|[NAMESERVER07](nameserver07.md)|To check whether authoritative name servers return an upward referral|
+|[NAMESERVER08](nameserver08.md)|Testing QNAME case insensitivity  |
+|[NAMESERVER09](nameserver09.md)|Testing QNAME case sensitivity|
+|[NAMESERVER10](nameserver10.md)|Test for undefined EDNS version|
+|[NAMESERVER11](nameserver11.md)|Test for unknown EDNS OPTION-CODE|
+|[NAMESERVER12](nameserver12.md)|Test for unknown EDNS flags|
+|[NAMESERVER13](nameserver13.md)|Test for truncated response on EDNS query|
+|[NAMESERVER15](nameserver15.md)|Checking for revealed software version|