fix: ajout constante EURO dans ContratMigrationSiteconseilPdf

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

src/Service/Pdf/ContratMigrationSiteconseilPdf.php

@@ -6,6 +6,10 @@ use App\Entity\Contrat;
 use setasign\Fpdi\Fpdi;
 use Symfony\Component\HttpKernel\KernelInterface;
 
+if (!\defined('EURO')) {
+    \define('EURO', \chr(128)); // @codeCoverageIgnore
+}
+
 class ContratMigrationSiteconseilPdf extends Fpdi
 {
     public function __construct(