refactor(vo): 重构VO对象结构，统一字段命名和接口实现

重构所有VO对象，统一字段命名规范，移除冗余字段，优化接口实现
新增Voable接口用于VO对象转换
调整BaseViewModel和ProjectBasedViewModel接口定义
更新相关服务和控制器以适应VO对象变更

client/src/main/java/com/ecep/contract/task/ContractFilesRebuildAllTasker.java

@@ -1,8 +1,8 @@
 package com.ecep.contract.task;
 
 import com.ecep.contract.MessageHolder;
-import com.ecep.contract.model.ContractGroup;
 import com.ecep.contract.service.ContractService;
+import com.ecep.contract.vo.ContractGroupVo;
 
 import lombok.Setter;
 
@@ -11,7 +11,7 @@ public class ContractFilesRebuildAllTasker extends Tasker<Object>{
     private ContractService contractService;
 
     @Setter
-    private ContractGroup group;
+    private ContractGroupVo group;
 
     @Override
     protected Object execute(MessageHolder holder) throws Exception {