add_action('admin_menu', function () {
    add_menu_page(
        'Future Systems',
        'Future Systems',
        'manage_options',
        'future-systems',
        'fs_render_main_ui',
        'dashicons-admin-generic',
        2
    );
});

function fs_render_main_ui() {

    $module = $_GET['fs_module'] ?? 'fnb-companies';
    $screen = $_GET['fs_screen'] ?? 'list';

    echo '<div class="wrap">';
    echo '<h1>🚀 Future Systems Ready</h1>';
    echo '<p>Core + FNB + Companies Installed</p>';

    echo '<hr>';

    // 🔥 THIS IS THE MISSING LINK
    do_action("fs_render_screen_{$module}_{$screen}");

    echo '</div>';
}<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://www.tabarrukk.com/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://www.tabarrukk.com/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://www.tabarrukk.com/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://www.tabarrukk.com/wp-sitemap-posts-e-floating-buttons-1.xml</loc></sitemap><sitemap><loc>https://www.tabarrukk.com/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://www.tabarrukk.com/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>