feat: Enhance email functionality and PDF generation for Sales Orders

- Enabled SMTP debugging in PHPMailer for better error tracking.
- Added a "Test send email" link in the Inventory Detail View for quick email testing.
- Implemented automatic PDF generation and email sending upon Sales Order creation.
- Created a new action for sending Sales Order emails with attached PDFs.
- Added a new AJAX action for testing outgoing email server configurations.
- Updated outgoing server settings to use new SMTP credentials.
- Improved email templates for better user experience.
- Added test scripts for validating PDF generation and email sending.

modules/Inventory/models/DetailView.php

@@ -36,6 +36,15 @@ class Inventory_DetailView_Model extends Vtiger_DetailView_Model {
             );
 
             $linkModelList['DETAILVIEW'][] = Vtiger_Link_Model::getInstanceFromValues($sendEmailLink);
+
+
+			$testsendEmailLink = array(
+                'linklabel' => "Test send email",
+                'linkurl' => 'javascript:Inventory_Detail_Js.testSendEmailPDFClickHandler(\''.$recordModel->getSendEmailPDFUrl().'\')',
+                'linkicon' => ''
+            );
+
+            $linkModelList['DETAILVIEW'][] = Vtiger_Link_Model::getInstanceFromValues($testsendEmailLink);
 		}
 
 		return $linkModelList;