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/Settings/Vtiger/views/OutgoingServerEdit.php

@@ -18,6 +18,7 @@ class Settings_Vtiger_OutgoingServerEdit_View extends Settings_Vtiger_Index_View
         $viewer->assign('MODEL',$systemDetailsModel);
 		$viewer->assign('QUALIFIED_MODULE', $qualifiedName);
 		$viewer->assign('CURRENT_USER_MODEL', Users_Record_Model::getCurrentUserModel());
+		$viewer->assign('TEST_MAIL', true);
         $viewer->view('OutgoingServerEdit.tpl',$qualifiedName);
     }