Allow editing orders in the order card

Cashiers can edit recipient, TTN, notes, goods and total in the order
modal and save via PATCH /orders/{id}. Edited orders get edited_at and
are no longer overwritten by CRM sync. Editing is blocked once a receipt
exists; changing the TTN resets Nova Poshta tracking fields.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/api/orders.ts

@@ -1,5 +1,5 @@
 import { apiFetch } from '@/api/client'
-import type { Order } from '@/features/orders/types'
+import type { Order, OrderUpdate } from '@/features/orders/types'
 
 export function getOrders(hasReceipt: boolean): Promise<Order[]> {
   return apiFetch<Order[]>(`/orders?has_receipt=${hasReceipt}`)
@@ -8,3 +8,7 @@ export function getOrders(hasReceipt: boolean): Promise<Order[]> {
 export function deleteOrder(orderId: string): Promise<void> {
   return apiFetch<void>(`/orders/${orderId}`, { method: 'DELETE' })
 }
+
+export function updateOrder(orderId: string, data: OrderUpdate): Promise<Order> {
+  return apiFetch<Order>(`/orders/${orderId}`, { method: 'PATCH', body: data })
+}