refactor: extract findUserOrder helper

server/src/lib/find-user-order.js

@@ -0,0 +1,12 @@
+export async function findUserOrder(prisma, orderId, userId, include = {}) {
+  const order = await prisma.order.findFirst({
+    where: { id: orderId, userId },
+    include,
+  })
+
+  if (!order) {
+    throw Object.assign(new Error('Order not found'), { statusCode: 404 })
+  }
+
+  return order
+}