feat: bouton purge des logs pour ROLE_ROOT

src/Controller/Admin/LogsController.php:
- Nouvelle route POST /admin/logs/purge: supprime tous les AppLog
  via requete DQL DELETE, accessible uniquement ROLE_ROOT
  (le controller entier est deja protege par ROLE_ROOT)

templates/admin/logs/index.html.twig:
- Bouton "Supprimer tous les logs" en haut a droite, rouge,
  visible uniquement pour ROLE_ROOT
- Confirmation data-confirm avant suppression

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Controller/Admin/LogsController.php

@@ -13,6 +13,7 @@ use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Routing\Attribute\Route;
 use Symfony\Component\Security\Http\Attribute\IsGranted;
+use Doctrine\ORM\EntityManagerInterface;
 use Twig\Environment;
 
 #[Route('/admin/logs', name: 'app_admin_logs')]
@@ -46,6 +47,19 @@ class LogsController extends AbstractController
         ]);
     }
 
+    #[Route('/purge', name: '_purge', methods: ['POST'])]
+    public function purge(EntityManagerInterface $em): Response
+    {
+        $deleted = $em->createQueryBuilder()
+            ->delete('App\Entity\AppLog', 'l')
+            ->getQuery()
+            ->execute();
+
+        $this->addFlash('success', $deleted.' log(s) supprime(s).');
+
+        return $this->redirectToRoute('app_admin_logs');
+    }
+
     #[Route('/{id}/pdf', name: '_pdf', methods: ['GET'])]
     public function pdf(
         int $id,

templates/admin/logs/index.html.twig

@@ -4,7 +4,14 @@
 
 {% block admin_content %}
 <div class="page-container">
-    <h1 class="text-2xl font-bold heading-page mb-8">Logs d'activite</h1>
+    <div class="flex items-center justify-between mb-8">
+        <h1 class="text-2xl font-bold heading-page">Logs d'activite</h1>
+        {% if is_granted('ROLE_ROOT') %}
+            <form method="post" action="{{ path('app_admin_logs_purge') }}" data-confirm="Supprimer tous les logs ? Cette action est irreversible.">
+                <button type="submit" class="btn-glass px-4 py-2 text-red-600 text-xs font-bold uppercase tracking-wider" style="border-color: rgba(220,38,38,0.3);">Supprimer tous les logs</button>
+            </form>
+        {% endif %}
+    </div>
 
     <div class="glass overflow-hidden">
         <table class="w-full text-xs">