Move a Shopify fulfillment order to a new location and create a fulfillment using fulfillmentOrderMove and fulfillmentCreateV2

Verified steps

1. Query `order.fulfillmentOrders` to retrieve the fulfillment order ID and its current assigned location; verify the fulfillment order status is OPEN before attempting to move it
2. Call `fulfillmentOrderMove(id: $fulfillmentOrderId, newLocationId: $locationId)` to reassign the fulfillment order to a different location; the mutation returns the moved fulfillment order and any remaining unfulfilled quantity at the original location
3. Confirm the fulfillment order's `assignedLocation` reflects the new location before creating the fulfillment
4. Call `fulfillmentCreateV2(fulfillment: { lineItemsByFulfillmentOrder: [{ fulfillmentOrderId: $id, fulfillmentOrderLineItems: [{ id: $lineId, quantity: 1 }] }], trackingInfo: { number: "1Z...", company: "UPS", url: "https://..." }, notifyCustomer: true })` to create the fulfillment and mark the items as shipped
5. Read the returned `fulfillment.id` and `fulfillment.status` (should be `SUCCESS`) and store this for order tracking
6. Subscribe to the `fulfillments/create` webhook to receive fulfillment events asynchronously rather than polling the order