fix: fclose avant lecture lazy du parser — passer closeStream=true

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

processor/process_mail.php

@@ -44,8 +44,7 @@ function process_account(array $account, MailMimeParser $parser): void {
         }
 
         $handle  = fopen($filePath, 'r');
-        $message = $parser->parse($handle, false);
+        $message = $parser->parse($handle, true); // true = parser gère la fermeture
-        fclose($handle);
 
         $subject = $message->getHeaderValue('Subject') ?? '(sans sujet)';
         $from    = '';