Add configuration for warranty and payment options, update email templates, and implement marketing file migration

- Created STEP3.txt for business rules and payment configurations.
- Modified listPartner function parameter order in functions.php.
- Updated invoice email template to reflect new contact details.
- Revised PDF invoice template to include updated contact information.
- Added user session checks in index.php for improved security.
- Introduced marketing_migrate.php to migrate existing marketing files to the database.
- Increased max-height of content blocks in admin.css for better UI.

api/v2/post/user_role_assignments.php

@@ -48,7 +48,7 @@ if (isset($post_content['batch_update']) && isset($post_content['user_id']) && i
             if ($existing){
                 //Reactivate existing assignment
                 $stmt = $pdo->prepare('UPDATE user_role_assignments SET is_active = 1, assigned_by = ?, assigned_at = ?, updatedby = ?, updated = ? WHERE rowID = ?');
-                $stmt->execute([$username, $date, $username, $date, $$username]);
+                $stmt->execute([$username, $date, $username, $date, $existing['rowID']]);
             } else {
                 //Create new assignment
                 $stmt = $pdo->prepare('INSERT INTO user_role_assignments (user_id, role_id, is_active, assigned_by, assigned_at, created, createdby) VALUES (?, ?, 1, ?, ?, ?, ?)');