feat(mail) : MailSyncTriggerController - POST /api/mail/sync (202 + Messenger async)

- dispatch MailSyncRequested au bus Messenger, retourne 202 immediat
- folderPath optionnel via body JSON pour sync ciblee
- en test : transport in-memory route le message en sync
- securite via MailAccessChecker

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/Functional/Controller/Mail/MailSyncTriggerControllerTest.php

@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Functional\Controller\Mail;
+
+use App\Entity\User;
+use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+
+/**
+ * @internal
+ */
+class MailSyncTriggerControllerTest extends WebTestCase
+{
+    public function testSyncTriggerReturns401WhenNotAuthenticated(): void
+    {
+        $client = static::createClient();
+        $client->request('POST', '/api/mail/sync');
+
+        self::assertResponseStatusCodeSame(401);
+    }
+
+    public function testSyncTriggerReturns403ForRoleClient(): void
+    {
+        $client    = static::createClient();
+        $container = static::getContainer();
+        $em        = $container->get('doctrine.orm.entity_manager');
+
+        $clientUser = $em->getRepository(User::class)->findOneBy(['username' => 'client-liot']);
+        $client->loginUser($clientUser);
+        $client->request('POST', '/api/mail/sync');
+
+        self::assertResponseStatusCodeSame(403);
+    }
+
+    public function testSyncTriggerReturns202ForRoleUser(): void
+    {
+        $client    = static::createClient();
+        $container = static::getContainer();
+        $em        = $container->get('doctrine.orm.entity_manager');
+
+        $user = $em->getRepository(User::class)->findOneBy(['username' => 'alice']);
+        $client->loginUser($user);
+        $client->request('POST', '/api/mail/sync');
+
+        self::assertResponseStatusCodeSame(202);
+        $data = json_decode($client->getResponse()->getContent(), true);
+        self::assertArrayHasKey('message', $data);
+    }
+}