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/t/translator.t

@@ -0,0 +1,64 @@
+use strict;
+use warnings;
+use Test::More tests => 2;
+use Test::NoWarnings;
+
+use File::Slurp;
+use POSIX qw[setlocale :locale_h];
+use Test::Fatal;
+use Zonemaster::Engine::Logger::Entry;
+use Zonemaster::Engine::Translator;
+
+my ($json, $profile_tmp);
+$json        = read_file( 't/profiles/Test-all.json' );
+$profile_tmp = Zonemaster::Engine::Profile->from_json( $json );
+Zonemaster::Engine::Profile->effective->merge( $profile_tmp );
+$json        = read_file( 't/profiles/Test-all-levels.json' );
+$profile_tmp = Zonemaster::Engine::Profile->from_json( $json );
+Zonemaster::Engine::Profile->effective->merge( $profile_tmp );
+
+Zonemaster::Engine::Translator->initialize( locale => 'C' );
+
+subtest 'Everything but Test::NoWarnings' => sub {
+    my $trans = Zonemaster::Engine::Translator->instance();
+    isa_ok $trans, 'Zonemaster::Engine::Translator',
+        'Zonemaster::Engine::Translator->instance()';
+
+    ok( exists $trans->data->{Basic}{B01_PARENT_FOUND}, 'expected key from file exists' );
+    ok( exists $trans->data->{System}{NO_NETWORK},      'expected key from module exists' );
+
+    my $entry = Zonemaster::Engine::Logger::Entry->new(
+        {
+            module   => 'Basic',
+            testcase => 'Basic01',
+            tag      => 'B01_PARENT_FOUND',
+            args     => { domain => 'nothing.nowhere', ns_list => 'ns1.nothing.nowhere/1.1.1.1' },
+        }
+    );
+
+    like(
+        $trans->to_string( $entry ),
+qr'   \d+.\d\d INFO      The parent zone is "nothing.nowhere" as returned from name servers "ns1.nothing.nowhere/1.1.1.1".',
+        'string to_stringd as expected'
+    );
+
+    my $untranslated = Zonemaster::Engine::Logger::Entry->new(
+        {
+            module   => 'SYSTEM',
+            testcase => 'Basic01',
+            tag      => 'START_TIME',
+            args     => { some => 'data' },
+        }
+    );
+
+    ok( $trans->translate_tag( $untranslated ), 'Untranslated tag gets output' );
+
+    my %methods = Zonemaster::Engine->all_methods();
+
+    foreach my $module ( keys %methods ) {
+        foreach my $testmethod ( @{ $methods{$module} } ) {
+            ok( $trans->_translate_tag( $module, uc( $testmethod ), {} ),
+                'Test method ' . uc( $testmethod ) . ' has message tag with description' );
+        }
+    }
+};