feat : add Zimbra settings API (CRUD + test connection)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ApiResource/ZimbraTestConnection.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\ApiResource;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Post;
+use App\State\ZimbraTestConnectionProvider;
+use Symfony\Component\Serializer\Attribute\Groups;
+
+#[ApiResource(
+    operations: [
+        new Post(
+            uriTemplate: '/settings/zimbra/test',
+            input: false,
+            normalizationContext: ['groups' => ['zimbra_test:read']],
+            provider: ZimbraTestConnectionProvider::class,
+            processor: ZimbraTestConnectionProvider::class,
+            security: "is_granted('ROLE_ADMIN')",
+        ),
+    ],
+)]
+final class ZimbraTestConnection
+{
+    #[Groups(['zimbra_test:read'])]
+    public bool $success = false;
+}