Implement version 0.0.11 features

- Add Created date column to admin license overview
- Add License Statistics page under WooCommerce menu
- Add REST API endpoints for analytics data with time-series support
- WooCommerce Analytics integration via submenu page

New files:
- src/Admin/AnalyticsController.php
- templates/admin/statistics.html.twig

REST API endpoints:
- GET /wc-licensed-product/v1/analytics/stats
- GET /wc-licensed-product/v1/analytics/products

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/Plugin.php

@@ -10,6 +10,7 @@ declare(strict_types=1);
 namespace Jeremias\WcLicensedProduct;
 
 use Jeremias\WcLicensedProduct\Admin\AdminController;
+use Jeremias\WcLicensedProduct\Admin\AnalyticsController;
 use Jeremias\WcLicensedProduct\Admin\OrderLicenseController;
 use Jeremias\WcLicensedProduct\Admin\SettingsController;
 use Jeremias\WcLicensedProduct\Admin\VersionAdminController;
@@ -68,6 +69,14 @@ final class Plugin
         return self::$instance;
     }
 
+    /**
+     * Get singleton instance (alias for instance())
+     */
+    public static function getInstance(): Plugin
+    {
+        return self::instance();
+    }
+
     /**
      * Private constructor for singleton
      */
@@ -125,6 +134,7 @@ final class Plugin
             new VersionAdminController($this->versionManager);
             new OrderLicenseController($this->licenseManager);
             new SettingsController();
+            (new AnalyticsController($this->licenseManager))->init();
         }
     }