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-backend/script/add-batch-job.pl

@@ -0,0 +1,42 @@
+#!/usr/bin/env perl
+
+# This script is for testing purpose only.
+
+use 5.14.2;
+use warnings;
+
+use Data::Dumper;
+use Encode qw[decode_utf8];
+use Zonemaster::Backend::RPCAPI;
+use Digest::MD5 qw(md5_hex);
+
+binmode STDOUT, ':utf8';
+
+my $e = Zonemaster::Backend::RPCAPI->new;
+
+say "Starting add_batch_job";
+my @domains;
+for (my $i = 0; $i < 100; $i++) {
+    push(@domains, substr(md5_hex(rand(10000)), 0, 5).".fr");
+}
+
+#die Dumper(\@domains);
+
+$e->add_api_user({ username => 'test_user', api_key => 'API_KEY_01'});
+
+$e->add_batch_job(
+    {
+        client_id      => 'Add Script',
+        client_version => '1.0',
+        username       => 'test_user',
+        api_key        => 'API_KEY_01',
+        test_params    => {
+            client_id      => 'Add Script',
+            client_version => '1.0',
+            ipv4           => 1,                   # 0 or 1, is the ipv4 checkbox checked
+            ipv6           => 1,                   # 0 or 1, is the ipv6 checkbox checked
+            profile        => 'default',           # the id if the Test profile listbox (unused)
+        },
+        domains => \@domains,
+    }
+    );