fix: 4 bugs - checkout virtual, login redirect, licensing, categories

1. Virtual-only checkout:
   - Added 'virtual' and 'downloadable' to CartController response
   - Checkout can now detect virtual-only carts

2. Login redirect:
   - Added useEffect to redirect logged-in users to /my-account

3. License generation:
   - Fixed meta key mismatch (_woonoow_licensing_enabled -> _licensing_enabled)

4. Product categories:
   - Added queryClient.invalidateQueries after creating new category
   - List now refreshes immediately

includes/Api/Controllers/CartController.php

@@ -365,6 +365,8 @@ class CartController extends WP_REST_Controller {
                 'total'        => $cart_item['line_total'],
                 'image'        => wp_get_attachment_image_url($product->get_image_id(), 'thumbnail'),
                 'permalink'    => $product->get_permalink(),
+                'virtual'      => $product->is_virtual(),
+                'downloadable' => $product->is_downloadable(),
             ];
         }