feat: add FormKit framework support and update dependencies

- Add `telecart_forms` table migration and default checkout form seeder
- Implement `FormsHandler` to fetch form schemas
- Update `OrderCreateService` to handle custom fields in order comments
- Add `update` method to QueryBuilder and Grammar
- Add `Arr::except` helper
- Update composer dependencies (Carbon, Symfony, PHPUnit, etc.)
- Improve `MigratorService` error handling
- Add unit tests for new functionality

frontend/admin/src/App.vue

@@ -30,6 +30,10 @@
         <RouterLink :to="{name: 'mainpage'}">Главная страница</RouterLink>
       </li>
 
+      <li :class="{active: route.name === 'formbuilder'}">
+        <RouterLink :to="{name: 'formbuilder'}">Форма заказа</RouterLink>
+      </li>
+
       <li :class="{active: route.name === 'logs'}">
         <RouterLink :to="{name: 'logs'}">Журнал событий</RouterLink>
       </li>