docs(order.entity): 更新total字段的ApiProperty描述

src/entity/order.entity.ts

@@ -106,7 +106,7 @@ export class Order {
   @Expose()
   cart_tax: number;
 
-  @ApiProperty()
+  @ApiProperty({ type: "总金额"})
   @Column('decimal', { precision: 10, scale: 2, default: 0 })
   @Expose()
   total: number;