Enhance SWJProjects Licensing: Domain Storage Plugin, Template Override & AJAX Validation

[NickGiannelis]

This PR delivers a comprehensive upgrade to SWJProjects license management by introducing three key components:

System Plugin (save_domain)

    Fixes domain storage in #__swjprojects_keys via AJAX

    Adds onAjaxSave_domain handler with direct SQL updates

    Includes debug logging for easier troubleshooting

Template Override

    Adds domain input field in userkeys/default.php
    Seamlessly integrates with the new system plugin

AJAX License Validator

    Enables real-time license key validation with domain and subdomain checks

    Verifies expiration dates (date_end)

    Returns JSON responses suitable for frontend or API clients

Testing & Compatibility:

    Tested on Joomla 5.x
    Compatible with existing KeysHelper logic

This solution builds on Sergey’s earlier suggestions and the following core resources:

Joomla AJAX Plugin documentation: https://manual.joomla.org/docs/building-extensions/plugins/plugin-examples/ajax-plugin/

KeysHelper checkKey method: https://github.com/WebTolk/SWJProjects/blob/master/com_swjprojects/site/src/Helper/KeysHelper.php

Notes:

Can be merged permanently or offered as an optional customization

Debug mode included for maintenance ease

Why This Matters:

Resolves persistent domain storage issues

Improves user experience with instant feedback

Maintains backward compatibility with existing workflows

Authored by Nick Giannelis.