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/behavior07.md

@@ -0,0 +1,33 @@
+## BEHAVIOR07: IDN Verification 
+
+### Test case identifier
+
+**BEHAVIOR07:** IDN Verification 
+
+### Objective 
+
+The objective of this test is to verify the engine verifies IDN domains
+
+### Inputs
+
+The IDN domain to be tested.
+
+### Ordered description of steps to be taken to execute the test case
+
+1. A standard query for an IDN domain is made using the zonemaster CLI
+2. If the output from the CLI does not verify the IDN domain as in the case of
+normal domain names, then the test fails 
+
+### Results
+As seen in the appendix, the engine is capable of verifying IDN domains
+
+### Appendix
+``` 
+zonemaster-cli café.fr
+Seconds Level     Message
+======= ========= =======
+  25.67 WARNING   All nameservers are in the same AS (16509).
+  25.67 WARNING   All nameservers IPv4 addresses are in the same AS (16509).
+  25.70 NOTICE    192.5.4.2 returned no DS records for xn--caf-dma.fr.
+
+