Fix license generation and checkout domain field bugs

- Add WooCommerce Checkout Blocks support for domain field
- Create CheckoutBlocksIntegration for block-based checkout
- Create StoreApiExtension for Store API domain handling
- Add checkout-blocks.js for frontend domain field in blocks
- Fix LicenseManager product type check in generateLicense()
- Add multiple order status hooks for reliable license generation

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

src/Plugin.php

@@ -13,7 +13,9 @@ use Jeremias\WcLicensedProduct\Admin\AdminController;
 use Jeremias\WcLicensedProduct\Admin\SettingsController;
 use Jeremias\WcLicensedProduct\Admin\VersionAdminController;
 use Jeremias\WcLicensedProduct\Api\RestApiController;
+use Jeremias\WcLicensedProduct\Checkout\CheckoutBlocksIntegration;
 use Jeremias\WcLicensedProduct\Checkout\CheckoutController;
+use Jeremias\WcLicensedProduct\Checkout\StoreApiExtension;
 use Jeremias\WcLicensedProduct\Email\LicenseEmailController;
 use Jeremias\WcLicensedProduct\Frontend\AccountController;
 use Jeremias\WcLicensedProduct\Frontend\DownloadController;
@@ -110,6 +112,8 @@ final class Plugin
         // Initialize controllers
         new LicensedProductType();
         new CheckoutController($this->licenseManager);
+        new StoreApiExtension($this->licenseManager);
+        $this->registerCheckoutBlocksIntegration();
         $this->downloadController = new DownloadController($this->licenseManager, $this->versionManager);
         new AccountController($this->twig, $this->licenseManager, $this->versionManager, $this->downloadController);
         new RestApiController($this->licenseManager);
@@ -122,13 +126,34 @@ final class Plugin
         }
     }
 
+    /**
+     * Register WooCommerce Checkout Blocks integration
+     */
+    private function registerCheckoutBlocksIntegration(): void
+    {
+        add_action('woocommerce_blocks_loaded', function (): void {
+            if (class_exists('Automattic\WooCommerce\Blocks\Integrations\IntegrationRegistry')) {
+                add_action(
+                    'woocommerce_blocks_checkout_block_registration',
+                    function ($integration_registry): void {
+                        $integration_registry->register(new CheckoutBlocksIntegration());
+                    }
+                );
+            }
+        });
+    }
+
     /**
      * Register plugin hooks
      */
     private function registerHooks(): void
     {
-        // Generate license on order completion
+        // Generate license on order completion (multiple hooks for compatibility)
         add_action('woocommerce_order_status_completed', [$this, 'onOrderCompleted']);
+        add_action('woocommerce_order_status_processing', [$this, 'onOrderCompleted']);
+
+        // Also hook into payment complete for immediate license generation
+        add_action('woocommerce_payment_complete', [$this, 'onOrderCompleted']);
     }
 
     /**