feat: add Imagick extension check in ConfigureCheckService

Add checkImagick() method to verify if Imagick extension is loaded.
Returns info message when not loaded, empty array when loaded.
Extension is required for visible signature features like background
images and signature element rendering.

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

Author: vitormattos

lib/Service/Install/ConfigureCheckService.php

@@ -69,6 +69,7 @@ public function checkSign(): array {
 		$return = array_merge($return, $this->checkPdftk());
 		$return = array_merge($return, $this->checkJSignPdf());
 		$return = array_merge($return, $this->checkPoppler());
+		$return = array_merge($return, $this->checkImagick());
 		return $return;
 	}
 
@@ -497,4 +498,24 @@ public function checkCertificate(): array {
 		}
 		return $return;
 	}
+
+	/**
+	 * Check if Imagick extension is loaded
+	 *
+	 * @return ConfigureCheckHelper[]
+	 */
+	public function checkImagick(): array {
+		if (!empty($this->result['imagick'])) {
+			return $this->result['imagick'];
+		}
+		if (!extension_loaded('imagick')) {
+			return $this->result['imagick'] = [
+				(new ConfigureCheckHelper())
+					->setInfoMessage('Imagick extension is not loaded')
+					->setResource('imagick')
+					->setTip('Install php-imagick to enable visible signatures, background images, and signature element rendering.'),
+			];
+		}
+		return $this->result['imagick'] = [];
+	}
 }