feat(oa): 新增项目进度节点批量插入功能

- 新增 NodeDTO 数据传输对象，用于封装节点信息
- 在 OaProjectScheduleStepMapper 中添加 saveBatch 批量插入方法
- 实现 OaProjectScheduleStepServiceImpl 的 batchInsertNodes 方法
- 新增 TableDataConstantUtil 工具类，提供初始化节点数据- 在 OaProjectScheduleController 中新增 addByProjectId 接口
- 扩展 OaProjectScheduleStep 实体类与 VO/BO 类的字段结构
-优化首次编辑时 endTime 和 originalEndTime 的赋值逻辑

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

@@ -22,6 +22,16 @@
         <result property="expectedDays"        column="expected_days"/>
         <result property="useFlag"        column="use_flag"/>
         <result property="header"        column="header"/>
+        <result property="tabNode" column="tab_node"/>
+        <result property="firstLevelNode" column="first_level_node"/>
+        <result property="secondLevelNode" column="second_level_node"/>
+        <result property="startTime" column="start_time"/>
+        <result property="originalEndTime" column="original_end_time"/>
+        <result property="endTime" column="end_time"/>
+        <result property="nodeHeader" column="node_header"/>
+        <result property="relatedDocs" column="related_docs"/>
+        <result property="relatedImages" column="related_images"/>
+        <result property="specification" column="specification"/>
 
         <!-- ========== 附件列表：多对一 折叠 ========= -->
         <collection property="fileList"
@@ -43,6 +53,28 @@
             WHERE a.oss_id = so.oss_id
             AND a.user_id = #{userId}) )
     </sql>
+    <insert id="saveBatch">
+        INSERT INTO oa_project_schedule_step (
+        schedule_id,
+        step_order,
+        step_name,
+        tab_node,
+        first_level_node,
+        second_level_node,
+        specification
+        ) VALUES
+        <foreach item="item" index="index" collection="list" separator=",">
+            (
+            #{item.scheduleId},
+            #{item.stepOrder},
+            #{item.stepName},
+            #{item.tabNode},
+            #{item.firstLevelNode},
+            #{item.secondLevelNode},
+            #{item.specification}
+            )
+        </foreach>
+    </insert>
 
     <update id="updateByStepAndScheduleId">
         UPDATE oa_project_schedule_step