feat(crm): 初始化客户与订单模块基础代码

- 新增客户信息实体类及对应业务对象、控制器、服务实现
- 新增正式订单主表与明细表相关实体类和业务逻辑
- 新增订单操作追溯表结构定义
- 配置MyBatis映射文件及基础CRUD接口
- 实现客户与订单的分页查询、导出、新增、修改、删除功能
- 添加Excel导入导出支持及相关VO转换配置

klp-crm/src/main/resources/mapper/CrmOrderItemMapper.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper
+PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.klp.crm.mapper.CrmOrderItemMapper">
+
+    <resultMap type="com.klp.crm.domain.CrmOrderItem" id="CrmOrderItemResult">
+        <result property="itemId" column="item_id"/>
+        <result property="orderId" column="order_id"/>
+        <result property="productType" column="product_type"/>
+        <result property="specRequire" column="spec_require"/>
+        <result property="productNum" column="product_num"/>
+        <result property="specialRequire" column="special_require"/>
+        <result property="itemAmount" column="item_amount"/>
+        <result property="remark" column="remark"/>
+        <result property="createBy" column="create_by"/>
+        <result property="createTime" column="create_time"/>
+        <result property="updateBy" column="update_by"/>
+        <result property="updateTime" column="update_time"/>
+        <result property="delFlag" column="del_flag"/>
+    </resultMap>
+
+
+</mapper>