Force full-width layout on admin Infra page

Override admin-main max-width to 100% for the infra dashboard.

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

templates/admin/infra.html.twig

@@ -3,6 +3,7 @@
 {% block title %}Infrastructure{% endblock %}
 
 {% block body %}
+<style>.admin-main { max-width: 100% !important; padding: 1.5rem !important; }</style>
 {% if snapshot_missing is defined and snapshot_missing %}
 <div class="admin-card mb-4">
     <p class="text-sm font-bold text-yellow-600">Aucun snapshot disponible. Lancez <code class="bg-gray-100 px-1">php bin/console app:infra:snapshot</code></p>