refactor: reuse shared metadata normalizer in loader

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

lib/Service/File/MetadataLoader.php

@@ -50,11 +50,7 @@ public function loadMetadata(?File $file, stdClass $fileData): void {
 			$fileData->totalPages = (int)($metadata['p'] ?? count($fileData->pages ?? []));
 			$fileData->pdfVersion = (string)($metadata['pdfVersion'] ?? '');
 
-			$metadata['p'] = $fileData->totalPages;
-			$extension = pathinfo($file->getName(), PATHINFO_EXTENSION);
-			if (!isset($metadata['extension']) || !is_string($metadata['extension']) || trim($metadata['extension']) === '') {
-				$metadata['extension'] = is_string($extension) && $extension !== '' ? strtolower($extension) : 'pdf';
-			}
+			$metadata = ValidationMetadataNormalizer::normalize($metadata, $file->getName(), $fileData->totalPages);
 			$fileData->metadata = $metadata;
 		} catch (\Throwable $e) {
 			$this->logger->warning('Failed to load file metadata: ' . $e->getMessage());