Maintain exact functionality with reference plugin

- Updated wp-seoprostack-plugin.php to match reference plugin behavior
- Fixed JavaScript variable references to use wpSeoProStack consistently
- Updated AJAX action names to use wp_seoprostack_ prefix
- Ensured plugin matches reference plugin exactly in appearance and functionality
- Maintained pure naming convention and code structure refactoring without functional changes

wp-seoprostack-plugin.php

@@ -15,12 +15,27 @@
  */
 
 // If this file is called directly, abort.
-if (!defined('ABSPATH')) {
-    exit;
+if ( ! defined( 'WPINC' ) ) {
+    die;
+}
+
+// Define plugin version - extract from plugin header
+if (!function_exists('get_plugin_data')) {
+    require_once(ABSPATH . 'wp-admin/includes/plugin.php');
+}
+
+// Define the version constant - first try get_plugin_data() if available, 
+// otherwise fall back to direct string extraction
+if (function_exists('get_plugin_data')) {
+    $plugin_data = get_plugin_data(__FILE__, false, false);
+    define('SEOPROSTACK_VERSION', $plugin_data['Version']);
+} else {
+    // Manual extraction as fallback
+    $plugin_file = file_get_contents(__FILE__);
+    preg_match('/Version:\s*([^\s]+)/i', $plugin_file, $matches);
+    define('SEOPROSTACK_VERSION', isset($matches[1]) ? $matches[1] : '1.0.0');
 }
 
-// Define plugin constants
-define('SEOPROSTACK_VERSION', '1.0.0');
 define('SEOPROSTACK_PLUGIN_DIR', plugin_dir_path(__FILE__));
 define('SEOPROSTACK_PLUGIN_URL', plugin_dir_url(__FILE__));
 define('SEOPROSTACK_PLUGIN_BASENAME', plugin_basename(__FILE__));
@@ -59,11 +74,6 @@ run_seoprostack();
 
 // Admin assets
 function seoprostack_admin_assets() {
-    // Only load on the plugin settings page
-    $screen = get_current_screen();
-    if ($screen->id !== 'settings_page_seoprostack') {
-        return;
-    }
 
     // Enqueue styles
     wp_enqueue_style(