feat(model): 在 ProjectBudgetCostDetailTemp 类中添加 categoryStr 字段

- 在 ProjectBudgetCostDetailTemp 类中添加 categoryStr 字段，用于存储类别字符串
- 使用 @Transient 注解标记该字段，表明它不是数据库表中的列

src/main/java/cn/palmte/work/model/ProjectBudgetCostDetailTemp.java

@@ -5,6 +5,7 @@ import lombok.Data;
 
 import javax.persistence.Entity;
 import javax.persistence.Table;
+import javax.persistence.Transient;
 
 /**
  * 项目预算成本明细临时表
@@ -13,6 +14,7 @@ import javax.persistence.Table;
 @Table(name = "project_budget_cost_detail_temp")
 @Data
 public class ProjectBudgetCostDetailTemp extends ProjectBudgetCostDetailBase{
+    @Transient
     private String categoryStr;
     public ProjectBudgetCostDetail toProjectBudgetCostDetail(){
         ProjectBudgetCostDetail detail = new ProjectBudgetCostDetail();