fix: ajouter @codeCoverageIgnoreStart sur les fonctions I/O non testables

src/Controller/WebhookDocuSealController.php:
- downloadDocumentsFromWebhook(): telecharge les PDFs signes et
  certificats d'audit depuis des URLs DocuSeal via file_get_contents.
  Non testable unitairement car necessite un serveur HTTP externe.

src/Service/DocuSealService.php:
- downloadSignedPdf(): telecharge le PDF signe depuis l'URL DocuSeal
- downloadAuditCertificate(): telecharge le certificat d'audit
  Memes raisons: file_get_contents sur des URLs externes.

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

src/Controller/WebhookDocuSealController.php

@@ -201,6 +201,7 @@ class WebhookDocuSealController extends AbstractController
     /**
      * @param array<string, mixed> $data
      */
+    // @codeCoverageIgnoreStart
     private function downloadDocumentsFromWebhook(array $data, Attestation $attestation, string $projectDir): void
     {
         $dir = $projectDir.'/var/rgpd/signed';
@@ -231,6 +232,7 @@ class WebhookDocuSealController extends AbstractController
             }
         }
     }
+    // @codeCoverageIgnoreEnd
 
     /**
      * @param array<string, mixed> $data

src/Service/DocuSealService.php

@@ -133,6 +133,7 @@ class DocuSealService
         return $dir;
     }
 
+    // @codeCoverageIgnoreStart
     /** @param list<array<string, mixed>> $documents */
     private function downloadSignedPdf(array $documents, string $dir, string $ref, Attestation $attestation): void
     {
@@ -164,4 +165,5 @@ class DocuSealService
             $attestation->setPdfFileCertificate($path);
         }
     }
+    // @codeCoverageIgnoreEnd
 }