feat: blocage si licence invalide/désactivée depuis Vision, cache 30min

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

web/includes/auth.php

@@ -13,6 +13,7 @@ function auth_check(): void {
         header('Location: /login.php');
         exit;
     }
+    if (function_exists('vision_enforce')) vision_enforce();
 }
 
 function admin_check(): void {