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.

fix_permissions.php

@@ -0,0 +1,24 @@
+<?php
+function chmodRecursive($path, $filePerm = 0644, $dirPerm = 0755)
+{
+    if (!file_exists($path)) return false;
+
+    if (is_file($path)) {
+        return chmod($path, $filePerm);
+    }
+
+    if (is_dir($path)) {
+        $dir = new DirectoryIterator($path);
+        foreach ($dir as $item) {
+            if ($item->isDot()) continue;
+            chmodRecursive($item->getPathname(), $filePerm, $dirPerm);
+        }
+        return chmod($path, $dirPerm);
+    }
+    return false;
+}
+
+$storagePath = __DIR__ . '/storage';
+chmodRecursive($storagePath);
+echo "✅ Permissions fixed for storage folder.";
+?>