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/upgrading/backend/upgrade_zonemaster_backend_ver_1.0.3.md

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+# Upgrade to 1.0.3
+
+## Upgrading the database
+
+If your Zonemaster database was created by a Zonemaster-Backend version smaller than
+v1.0.3, and not upgraded, use the following instructions.
+
+### FreeBSD
+
+If the installation is on FreeBSD, then the environment maybe has to be set before
+running any of the commands below. Check where `backend_config.ini` is located.
+
+```sh
+export ZONEMASTER_BACKEND_CONFIG_FILE="/usr/local/etc/zonemaster/backend_config.ini"
+```
+
+### MySQL
+
+Run
+```sh
+cd $(perl -MFile::ShareDir -le 'print File::ShareDir::dist_dir("Zonemaster-Backend")')
+perl patch/patch_mysql_db_zonemaster_backend_ver_1.0.3.pl
+```
+
+### PostgreSQL
+
+Run
+```sh
+cd $(perl -MFile::ShareDir -le 'print File::ShareDir::dist_dir("Zonemaster-Backend")')
+perl patch/patch_postgresql_db_zonemaster_backend_ver_1.0.3.pl
+```

zonemaster/docs/public/upgrading/backend/upgrade_zonemaster_backend_ver_1.1.0.md

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+# Upgrade to 1.1.0
+
+## Upgrading the database
+
+If your Zonemaster database was created by a Zonemaster-Backend version smaller than
+v1.1.0, and not upgraded, use the following instructions.
+
+### MySQL
+
+```sql
+  ALTER TABLE test_results ADD queue INTEGER DEFAULT 0;
+```
+
+### PostgreSQL
+
+```sql
+  ALTER TABLE test_results ADD queue INTEGER DEFAULT 0;
+```
+

zonemaster/docs/public/upgrading/backend/upgrade_zonemaster_backend_ver_11.1.0.md

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+# Upgrade to 11.1.0
+
+## Upgrading the database
+
+If your Zonemaster database was created by a Zonemaster-Backend version smaller
+than v11.1.0, and not upgraded, use the following instruction.
+
+> You may need to run these command with root privileges.
+
+**Warning:** this database update will result in an increase of the used size.
+Make sure you have enough free disk space before upgrading. Depending on the
+database engine, you may need up to **5 times the database size of free space**.
+
+### Upgrade database schema
+
+```sh
+cd `perl -MFile::ShareDir -le 'print File::ShareDir::dist_dir("Zonemaster-Backend")'`
+perl patch/patch_db_zonemaster_backend_ver_11.1.0.pl
+```

zonemaster/docs/public/upgrading/backend/upgrade_zonemaster_backend_ver_11.2.0.md

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+# Upgrade to 11.2.0
+
+## Upgrading the database
+
+If your Zonemaster database was created by a Zonemaster-Backend version smaller
+than v11.2.0, and not upgraded, use the following instructions.
+
+> You may need to run these command with root privileges.
+
+### Migration script
+
+The following script fixes existing untranslated entries that were missed between 
+Zonemaster-Backend v11.1.0 (release v2023.2) and this version (release v2024.1).
+```sh
+cd `perl -MFile::ShareDir -le 'print File::ShareDir::dist_dir("Zonemaster-Backend")'`
+perl patch/patch_db_zonemaster_backend_ver_11.2.0.pl
+```

zonemaster/docs/public/upgrading/backend/upgrade_zonemaster_backend_ver_5.0.0.md

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+# Upgrade to 5.0.0
+
+## Upgrading the database
+
+If your Zonemaster database was created by a Zonemaster-Backend version smaller than
+v5.0.0, and not upgraded, use the following instructions.
+
+### FreeBSD
+
+If the installation is on FreeBSD, then set the environment before running any
+of the commands below:
+
+```sh
+export ZONEMASTER_BACKEND_CONFIG_FILE="/usr/local/etc/zonemaster/backend_config.ini"
+```
+
+### MySQL (or MariaDB)
+
+Run
+```sh
+cd $(perl -MFile::ShareDir -le 'print File::ShareDir::dist_dir("Zonemaster-Backend")')
+perl patch/patch_mysql_db_zonemaster_backend_ver_5.0.0.pl
+```
+
+
+### PostgreSQL
+
+Run
+```sh
+cd $(perl -MFile::ShareDir -le 'print File::ShareDir::dist_dir("Zonemaster-Backend")')
+perl patch/patch_postgresql_db_zonemaster_backend_ver_5.0.0.pl
+```
+
+
+
+

zonemaster/docs/public/upgrading/backend/upgrade_zonemaster_backend_ver_5.0.2.md

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+# Upgrade to 5.0.2
+
+## Upgrading the database
+
+If your Zonemaster database was created by a Zonemaster-Backend version smaller than
+v5.0.2, and not upgraded, use the following instructions.
+
+### FreeBSD
+
+If the installation is on FreeBSD, then set the environment before running any
+of the commands below:
+
+```sh
+export ZONEMASTER_BACKEND_CONFIG_FILE="/usr/local/etc/zonemaster/backend_config.ini"
+```
+
+### MySQL (or MariaDB)
+
+Run
+```sh
+cd $(perl -MFile::ShareDir -le 'print File::ShareDir::dist_dir("Zonemaster-Backend")')
+perl patch/patch_mysql_db_zonemaster_backend_ver_5.0.2.pl
+```
+
+### PostgreSQL
+
+No patching (upgrading) is needed on zonemaster database on PostgreSQL for this
+version of Zonemaster-Backend.
+

zonemaster/docs/public/upgrading/backend/upgrade_zonemaster_backend_ver_8.0.0.md

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+# Upgrade to 8.0.0
+
+On FreeBSD run the following command first to become root:
+
+```sh
+su -l
+```
+
+## New dependencies
+
+Zonemaster::Backend requires new dependencies. Depending on the used OS, run
+the corresponding command.
+
+### Rocky Linux
+
+```sh
+sudo dnf install perl-libintl perl-Mojolicious
+```
+
+```sh
+sudo cpanm Plack::Middleware::ReverseProxy
+```
+
+### Debian / Ubuntu
+
+```sh
+sudo apt-get install libplack-middleware-reverseproxy-perl libintl-perl libmojolicious-perl
+```
+
+#### Specific to Ubuntu
+
+```sh
+sudo cpanm JSON::Validator
+```
+
+### FreeBSD
+
+```sh
+pkg install p5-Plack-Middleware-ReverseProxy p5-Locale-libintl p5-Mojolicious
+```
+
+
+## Changes in the ini file
+
+New sections and properties have been added to the `backend_config.ini` file.
+By default the `add_api_user` method is disabled. To enable it, add the
+following to your `backend_config.ini` file:
+
+```
+[RPCAPI]
+enable_add_api_user = yes
+```
+
+> See the [Configuration document] for more information.
+
+
+## Upgrading init scripts
+
+The `zm-rpcapi` (`zm_rpcapi` on FreeBSD) init script has been updated. It needs
+to be reinstalled.
+
+### Rocky Linux
+
+```
+cd `perl -MFile::ShareDir=dist_dir -E 'say dist_dir("Zonemaster-Backend")'`
+sudo install -v -m 755 ./zm-rpcapi.lsb /etc/init.d/zm-rpcapi
+```
+
+### Debian / Ubuntu
+
+```
+cd `perl -MFile::ShareDir=dist_dir -E 'say dist_dir("Zonemaster-Backend")'`
+sudo install -v -m 755 ./zm-rpcapi.lsb /etc/init.d/zm-rpcapi
+```
+
+### FreeBSD
+
+```
+cd `perl -MFile::ShareDir=dist_dir -E 'say dist_dir("Zonemaster-Backend")'`
+install -v -m 755 ./zm_rpcapi-bsd /usr/local/etc/rc.d/zm_rpcapi
+```
+
+
+## Upgrading the database
+
+If your Zonemaster database was created by a Zonemaster-Backend version smaller
+than v8.0.0, and not upgraded, use the following instructions.
+
+> Depending on the database size this upgrade can take some time (around
+> 30 minutes for a database with 1 million entries)
+
+> You may need to run the command with `sudo`.
+
+### SQLite
+
+Run
+```sh
+cd `perl -MFile::ShareDir -le 'print File::ShareDir::dist_dir("Zonemaster-Backend")'`
+perl patch/patch_sqlite_db_zonemaster_backend_ver_8.0.0.pl
+```
+
+### MySQL (or MariaDB)
+
+First update the privileges of the `zonemaster` user:
+* Linux
+  ```sh
+  sudo mysql -e "GRANT ALL ON zonemaster.* TO 'zonemaster'@'localhost';"
+  ```
+* FreeBSD
+  ```sh
+  mysql -u root -p -e "GRANT ALL ON zonemaster.* TO 'zonemaster'@'localhost';"
+  ```
+
+
+then run
+```sh
+cd `perl -MFile::ShareDir -le 'print File::ShareDir::dist_dir("Zonemaster-Backend")'`
+perl patch/patch_mysql_db_zonemaster_backend_ver_8.0.0.pl
+```
+
+### PostgreSQL
+
+Run
+```sh
+cd `perl -MFile::ShareDir -le 'print File::ShareDir::dist_dir("Zonemaster-Backend")'`
+perl patch/patch_postgresql_db_zonemaster_backend_ver_8.0.0.pl
+```
+
+[Configuration document]: ../../configuration/backend.md

zonemaster/docs/public/upgrading/backend/upgrade_zonemaster_backend_ver_9.0.0.md

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+# Upgrade to 9.0.0
+
+## Upgrading the database
+
+If your Zonemaster database was created by a Zonemaster-Backend version smaller
+than v9.0.0, and not upgraded, use the following instruction.
+
+> You may need to run these command with root privileges.
+
+### Preparation when using MariaDB
+
+If you're using MariaDB you need to make a backup of your database before
+upgrading its schema.
+
+```sh
+mysqldump zonemaster > backup-file.sql
+```
+
+In case the schema upgrade fails you may need to restore the backup before
+trying again.
+
+```sh
+mysql zonemaster < backup-file.sql
+```
+
+### Upgrade database schema
+
+```sh
+cd `perl -MFile::ShareDir -le 'print File::ShareDir::dist_dir("Zonemaster-Backend")'`
+perl patch/patch_db_zonemaster_backend_ver_9.0.0.pl
+```