style: fix code style (phpcs)

Remove unused import and fix PHPDoc formatting:
- Remove unused DocMdpLevel import from JSignPdfHandler
- Fix trailing whitespace in AdminController PHPDoc

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

Author: vitormattos

lib/Controller/AdminController.php

@@ -867,7 +867,7 @@ public function footerTemplatePreviewPdf(string $template = '', int $width = 595
 	 * @param bool $enabled Enable or disable DocMDP certification
 	 * @param int $defaultLevel Default DocMDP level (0-3): 0=none, 1=no changes, 2=form fill, 3=form fill + annotations
 	 * @return DataResponse<Http::STATUS_OK, array{message: string}, array{}>|DataResponse<Http::STATUS_BAD_REQUEST, array{error: string}, array{}>|DataResponse<Http::STATUS_INTERNAL_SERVER_ERROR, array{error: string}, array{}>
-	 * 
+	 *
 	 * 200: Configuration saved successfully
 	 * 400: Invalid DocMDP level provided
 	 * 500: Internal server error

lib/Handler/SignEngine/JSignPdfHandler.php

@@ -11,7 +11,6 @@
 use Imagick;
 use ImagickPixel;
 use OCA\Libresign\AppInfo\Application;
-use OCA\Libresign\Enum\DocMdpLevel;
 use OCA\Libresign\Exception\LibresignException;
 use OCA\Libresign\Handler\CertificateEngine\CertificateEngineFactory;
 use OCA\Libresign\Helper\JavaHelper;