fix(orders): getOwned 统一带 relations，修复 include 分支的类型错误

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

src/orders/orders.service.ts

@@ -29,10 +29,10 @@ export class OrdersService {
     };
   }
 
-  private async getOwned(userId: string, id: string, includeRelations = false) {
+  private async getOwned(userId: string, id: string) {
     const order = await this.prisma.order.findUnique({
       where: { id },
-      include: includeRelations ? { items: true, payment: true } : undefined,
+      include: { items: true, payment: true },
     });
     if (!order) throw new NotFoundException('订单不存在');
     if (order.userId !== userId) throw new ForbiddenException('无权操作该订单');
@@ -62,7 +62,7 @@ export class OrdersService {
 
   async findOne(userId: string, id: string) {
     // 越权 403 / 不存在 404（契约 §6）
-    const order = await this.getOwned(userId, id, true);
+    const order = await this.getOwned(userId, id);
     return this.toClientOrder(order);
   }