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/controller/BaseController.java

@@ -11,6 +11,7 @@ import java.util.function.Consumer;
 
 import com.ecep.contract.util.FxmlPath;
 import com.ecep.contract.util.FxmlUtils;
+import com.ecep.contract.vo.EmployeeVo;
 import org.apache.logging.log4j.util.Strings;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -184,7 +185,7 @@ public class BaseController {
     private String stageKey;
     public Label leftStatusLabel;
     public Label rightStatusLabel;
-    private Employee currentUser;
+    private EmployeeVo currentUser;
 
     private HashMap<Class<?>, Object> cachedBeans = new HashMap<>();
 
@@ -210,7 +211,7 @@ public class BaseController {
         return getCachedBean(EmployeeService.class);
     }
 
-    public Employee getCurrentUser() {
+    public EmployeeVo getCurrentUser() {
         if (currentUser == null) {
             currentUser = getEmployeeService().findById(Desktop.instance.getActiveEmployeeId());
         }