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/ContractItemVo.java

@@ -0,0 +1,35 @@
+package com.ecep.contract.vo;
+
+import com.ecep.contract.model.IdentityEntity;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import lombok.Data;
+
+@Data
+public class ContractItemVo implements IdentityEntity {
+    private Integer id;
+    private Integer contractId;
+    private String contractCode;
+    private String contractName;
+    private Integer refId;
+    private String itemCode;
+    private String title;
+    private String specification;
+    private String unit;
+    private Integer inventoryId;
+    private String inventoryName;
+    private Double exclusiveTaxPrice;
+    private Double taxRate;
+    private Double taxPrice;
+    private Double quantity;
+    private LocalDateTime createDate;
+    private LocalDateTime updateDate;
+    private LocalDate startDate;
+    private LocalDate endDate;
+    private Integer creatorId;
+    private String creatorName;
+    private Integer updaterId;
+    private String updaterName;
+    private String remark;
+    private Integer order;
+}