feat: integrate with MailJet API for newsletter registration

migrations/Version20260318113000.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260318113000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Create newsletter_opt_in_confirmation table for double opt-in confirmations';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql("CREATE TABLE newsletter_opt_in_confirmation (id INT AUTO_INCREMENT NOT NULL, email VARCHAR(255) NOT NULL, token_hash VARCHAR(64) NOT NULL, expires_at DATETIME NOT NULL COMMENT '(DC2Type:datetime_immutable)', confirmed_at DATETIME DEFAULT NULL COMMENT '(DC2Type:datetime_immutable)', created_at DATETIME NOT NULL COMMENT '(DC2Type:datetime_immutable)', UNIQUE INDEX UNIQ_NEWSLETTER_OPT_IN_TOKEN_HASH (token_hash), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE `utf8mb4_unicode_ci` ENGINE = InnoDB");
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('DROP TABLE newsletter_opt_in_confirmation');
+    }
+}