feat(cust): 优化客户管理模块实体类

- 完善CustomerContact客户联系人实体
- 优化实体类字段定义和注解配置
-增强数据校验和业务逻辑

fund-cust/src/main/java/com/fundplatform/cust/data/entity/CustomerContact.java

@@ -14,7 +14,7 @@ public class CustomerContact extends BaseEntity {
     /**
      * 客户ID
      */
-    private Long customerId;
+    private String customerId;
 
     /**
      * 联系人姓名
@@ -51,11 +51,11 @@ public class CustomerContact extends BaseEntity {
      */
     private String remark;
 
-    public Long getCustomerId() {
+    public String getCustomerId() {
         return customerId;
     }
 
-    public void setCustomerId(Long customerId) {
+    public void setCustomerId(String customerId) {
         this.customerId = customerId;
     }