feat(common): 新增多个 VO 类

- 新增了多个与公司、合同、项目、库存等相关的 VO 类
- 这些类用于数据传输和接口定义，提高了系统的可维护性和扩展性
- 使用了 Lombok 注解，简化了类的编写

common/src/main/java/com/ecep/contract/vo/DepartmentVo.java

@@ -0,0 +1,17 @@
+package com.ecep.contract.vo;
+
+import com.ecep.contract.model.IdentityEntity;
+import lombok.Data;
+
+@Data
+public class DepartmentVo implements IdentityEntity {
+    private Integer id;
+    private String name;
+    private String code;
+    private Integer parentId;
+    private Integer order;
+    private Integer leaderId;
+    private String leaderName;
+    private String description;
+    private boolean active = false;
+}