Add contact form with reCAPTCHA, saved to DB, viewable in admin

Adds a public /contact page (name/email/message, protected by the same
reCAPTCHA v3 setup used on registration) that persists submissions to
a new contact_message table, plus a Contact section in the admin panel
to read them. Linked from the site footer.

migrations/Version20260829120000.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260829120000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Create contact_message table for the public contact form';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('CREATE TABLE contact_message (id INT AUTO_INCREMENT NOT NULL, name VARCHAR(255) NOT NULL, email VARCHAR(255) NOT NULL, message LONGTEXT NOT NULL, created_at DATETIME NOT NULL, PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE `utf8mb4_unicode_ci` ENGINE = InnoDB');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('DROP TABLE contact_message');
+    }
+}