feat(oa): 添加签约公司字段

- 在 ProjectProfitLossVO 类中添加 signingCompany 字段，用于存储签约公司信息
- 在 SysOaProjectMapper.xml 文件中添加签约公司的 SQL 查询语句

ruoyi-oa/src/main/java/com/ruoyi/oa/domain/vo/ProjectProfitLossVO.java

@@ -32,5 +32,7 @@ public class ProjectProfitLossVO {
     @JsonFormat(shape = JsonFormat.Shape.STRING)
     private BigDecimal profitLoss;  //盈亏金额
     // ...其他字段
+    //签约公司
+    private Integer signingCompany;
 
 }

ruoyi-oa/src/main/resources/mapper/oa/SysOaProjectMapper.xml

@@ -833,6 +833,7 @@
             p.project_status,
             p.funds AS original_funds,
             p.remark AS project_remark,
+            p.signing_company AS signingCompany,
             COALESCE(finance_details.total_income, 0) AS detail_income,
             COALESCE(finance_details.total_expenditure, 0) AS total_expenditure,
             CASE