feat(api): add statusText to envelope files response

Add statusText field to each file in the envelope's files array to provide
human-readable status information in the API response.

Signed-off-by: Vitor Mattos <[email protected]>

Author: vitormattos

lib/Controller/FileController.php

@@ -501,6 +501,7 @@ public function addFileToEnvelope(string $uuid): DataResponse {
 					'uuid' => $childFile->getUuid(),
 					'name' => $childFile->getName(),
 					'status' => $childFile->getStatus(),
+					'statusText' => $this->fileMapper->getTextOfStatus($childFile->getStatus()),
 				];
 			}