Implement version 0.0.2 features

Add product version management:
- ProductVersion model and VersionManager class
- VersionAdminController with meta box on product edit page
- AJAX-based version CRUD (add, delete, toggle status)
- JavaScript for version management UI

Add email notifications:
- LicenseEmailController for order emails
- License keys included in order completed emails
- Support for both HTML and plain text emails

Add REST API rate limiting:
- 30 requests per minute per IP
- Cloudflare and proxy-aware IP detection
- HTTP 429 response with Retry-After header

Other changes:
- Bump version to 0.0.2
- Update CHANGELOG.md
- Add version status styles to admin.css

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

src/Plugin.php

@@ -10,11 +10,14 @@ declare(strict_types=1);
 namespace Jeremias\WcLicensedProduct;
 
 use Jeremias\WcLicensedProduct\Admin\AdminController;
+use Jeremias\WcLicensedProduct\Admin\VersionAdminController;
 use Jeremias\WcLicensedProduct\Api\RestApiController;
 use Jeremias\WcLicensedProduct\Checkout\CheckoutController;
+use Jeremias\WcLicensedProduct\Email\LicenseEmailController;
 use Jeremias\WcLicensedProduct\Frontend\AccountController;
 use Jeremias\WcLicensedProduct\License\LicenseManager;
 use Jeremias\WcLicensedProduct\Product\LicensedProductType;
+use Jeremias\WcLicensedProduct\Product\VersionManager;
 use Twig\Environment;
 use Twig\Loader\FilesystemLoader;
 
@@ -38,6 +41,11 @@ final class Plugin
      */
     private LicenseManager $licenseManager;
 
+    /**
+     * Version manager
+     */
+    private VersionManager $versionManager;
+
     /**
      * Get singleton instance
      */
@@ -90,15 +98,18 @@ final class Plugin
     private function initComponents(): void
     {
         $this->licenseManager = new LicenseManager();
+        $this->versionManager = new VersionManager();
 
         // Initialize controllers
         new LicensedProductType();
         new CheckoutController($this->licenseManager);
         new AccountController($this->twig, $this->licenseManager);
         new RestApiController($this->licenseManager);
+        new LicenseEmailController($this->licenseManager);
 
         if (is_admin()) {
             new AdminController($this->twig, $this->licenseManager);
+            new VersionAdminController($this->versionManager);
         }
     }