feat(order): 新增订单管理功能 V2

- 新增订单创建、查询、备注更新、申请退款等接口
- 添加订单相关实体类和枚举类
- 实现订单事件监听器，处理支付、退款、订单状态变化
- 优化移动端订单创建逻辑，集成订单服务

src/main/java/com/ycwl/basic/order/mapper/OrderDiscountMapper.java

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+package com.ycwl.basic.order.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.ycwl.basic.order.entity.OrderDiscountV2;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 订单优惠记录表Mapper接口
+ */
+@Mapper
+public interface OrderDiscountMapper extends BaseMapper<OrderDiscountV2> {
+}

src/main/java/com/ycwl/basic/order/mapper/OrderItemMapper.java

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+package com.ycwl.basic.order.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.ycwl.basic.order.entity.OrderItemV2;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 订单商品明细表Mapper接口
+ */
+@Mapper
+public interface OrderItemMapper extends BaseMapper<OrderItemV2> {
+}

src/main/java/com/ycwl/basic/order/mapper/OrderMapper.java

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+package com.ycwl.basic.order.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.ycwl.basic.order.entity.OrderV2;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 订单表Mapper接口
+ */
+@Mapper
+public interface OrderMapper extends BaseMapper<OrderV2> {
+}

src/main/java/com/ycwl/basic/order/mapper/OrderRefundMapper.java

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+package com.ycwl.basic.order.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.ycwl.basic.order.entity.OrderRefundV2;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 订单退款记录表Mapper接口
+ */
+@Mapper
+public interface OrderRefundMapper extends BaseMapper<OrderRefundV2> {
+}