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.

src/Website/Repository/ContactMessageRepository.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Website\Repository;
+
+use App\Website\Entity\ContactMessage;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+/**
+ * @extends ServiceEntityRepository<ContactMessage>
+ */
+class ContactMessageRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, ContactMessage::class);
+    }
+}