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-engine/share/profile_additional_properties.json

@@ -0,0 +1,68 @@
+{
+    "resolver" : {
+        "source4": "192.0.2.53",
+        "source6": "2001:db8::42"
+    },
+    "cache": {
+        "redis": {
+            "server": "127.0.0.1:6379",
+            "expire": 300
+        }
+    },
+    "logfilter" : {
+        "BASIC" : {
+            "IPV6_ENABLED" : [
+                {
+                    "when" : {
+                        "rrtype" : "NS",
+                        "ns" : "f.ext.nic.fr",
+                        "address" : "2001:67c:1010:11::53"
+                    },
+                    "set" : "WARNING"
+                },
+                {
+                    "when" : {
+                        "ns" : "h.ext.nic.fr"
+                    },
+                    "set" : "ERROR"
+                }
+            ]
+        },
+        "CONNECTIVITY" : {
+            "NAMESERVER_HAS_TCP_53" : [
+                {
+                    "when" : {
+                        "ns" : [ "ns1.nic.fr", "ns2.nic.fr" ]
+                    },
+                    "set" : "WARNING"
+                },
+                {
+                    "when" : {
+                        "address" : "2001:620:0:ff::2f"
+                    },
+                    "set" : "ERROR"
+                }
+            ]
+        }
+    },
+    "test_cases_vars": {
+        "dnssec04" : {
+            "DURATION_LONG" : 26179200,
+            "REMAINING_LONG" : 26179200,
+            "REMAINING_SHORT" : 43200
+        },
+        "zone02" : {
+            "SOA_REFRESH_MINIMUM_VALUE" : 14400
+        },
+        "zone04" : {
+            "SOA_RETRY_MINIMUM_VALUE" : 3600
+        },
+        "zone05" : {
+            "SOA_EXPIRE_MINIMUM_VALUE" : 604800
+        },
+        "zone06" : {
+            "SOA_DEFAULT_TTL_MAXIMUM_VALUE" : 86400,
+            "SOA_DEFAULT_TTL_MINIMUM_VALUE" : 300
+        }
+    }
+}