refactor(oa): 移除项目实体中的删除标志字段

- 删除 SysOaProject 实体类中的 delFlag 字段
- 移除查询条件中对 delFlag 的过滤逻辑
- 简化项目负责人匹配的查询条件

ruoyi-oa/src/main/java/com/ruoyi/oa/domain/SysOaProject.java

@@ -167,6 +167,4 @@ public class SysOaProject extends BaseEntity {
 
     //是否置顶
     private Integer isTop;
-    //是否删除
-    private Integer delFlag;
 }

ruoyi-oa/src/main/java/com/ruoyi/oa/service/impl/OaProjectScheduleStepServiceImpl.java

@@ -375,7 +375,6 @@ public class OaProjectScheduleStepServiceImpl implements IOaProjectScheduleStepS
                 Wrappers.<SysOaProject>lambdaQuery()
                         .in(SysOaProject::getProjectId, projectIds)
                         .eq(SysOaProject::getFunctionary, nickName) // 项目负责人匹配
-                        .eq(SysOaProject::getDelFlag, "0")
         );
         result.put("responsibleProjects", responsibleProjects); // 负责的项目列表