feat(crm): 添加合同实体中的客户ID字段支持

- 在CrmContract实体类中新增customerId字段
- 在CrmContractBo业务对象中添加customerId属性
- 更新CrmContractMapper.xml映射文件加入customer_id结果映射
- 在查询条件中增加customerId过滤逻辑
- 为CrmContractVo视图对象添加customerId字段并配置Excel导出

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

@@ -10,6 +10,7 @@
         <result property="contractNo" column="contract_no"/>
         <result property="supplier" column="supplier"/>
         <result property="customer" column="customer"/>
+        <result property="customerId" column="customer_id"/>
         <result property="deliveryDate" column="delivery_date"/>
         <result property="signTime" column="sign_time"/>
         <result property="signLocation" column="sign_location"/>