Create categories in batch
Create or update multiple ecommerce categories in a single request. The `categories` array accepts up to 100 category objects, each requiring a unique `id`. When `updateEnabled` is `false` (the default), all categories are inserted as new; if any ID already exists, a `400` error is returned. When `updateEnabled` is `true`, existing categories are updated and new ones are created via upsert. Duplicate IDs within the same request payload are rejected. The response returns the count of created and updated categories.