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/Delegation-TP/delegation07.md

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+## DELEGATION07: Parent glue name records present in child
+
+### Test case identifier
+
+**DELEGATION07:** Parent glue name records present in child
+
+### Objective
+
+If the list of name servers for a domain obtained from its parent are not
+found in its child zone, then it leads to an inconsistency (section 2.3
+of [RIPE-114](https://www.ripe.net/publications/docs/ripe-114))
+
+### Inputs
+
+The domain name to be tested.
+
+### Ordered description of steps to be taken to execute the test case
+
+1. Obtain the complete set of name servers from the parent using
+   [Method2](../Methods.md) and the child using [Method3](../Methods.md).
+3. If the set of NS names obtained from [Method2](../Methods.md) are 
+   not found in [Method3](../Methods.md), then the test fails.
+
+### Outcome(s)
+
+If the set of glue name records obtained are found in the list of name
+servers obtained from the child also, then the test succeeds
+
+### Special procedural requirements
+
+None
+
+### Intercase dependencies
+
+None