feat(ops): 扩展表增加时长统计字段

- 新增 dispatchedTime: 最近下发时间
- 新增 firstDispatchedTime: 首次下发时间（不受暂停影响）
- 新增 insertOrUpdateSelective 方法，保留 firstDispatchedTime

用于计算响应时长：arrivedTime - firstDispatchedTime - totalPauseSeconds

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

viewsh-module-ops/viewsh-module-environment-biz/src/main/java/com/viewsh/module/ops/environment/dal/dataobject/workorder/OpsOrderCleanExtDO.java

@@ -42,6 +42,14 @@ public class OpsOrderCleanExtDO extends BaseDO {
      * 预计作业时长（分钟）
      */
     private Integer expectedDuration;
+    /**
+     * 实际下发时间
+     */
+    private LocalDateTime dispatchedTime;
+    /**
+     * 首次下发时间（用于计算响应时长，不受暂停影响）
+     */
+    private LocalDateTime firstDispatchedTime;
     /**
      * 实际到岗时间
      */

viewsh-module-ops/viewsh-module-environment-biz/src/main/java/com/viewsh/module/ops/environment/dal/mysql/workorder/OpsOrderCleanExtMapper.java

@@ -38,4 +38,26 @@ public interface OpsOrderCleanExtMapper extends BaseMapperX<OpsOrderCleanExtDO>
         }
     }
 
+    /**
+     * 插入或选择性更新扩展信息
+     * <p>
+     * 只更新非空字段，且保留 firstDispatchedTime（已存在时不覆盖）
+     *
+     * @param entity 扩展信息实体
+     * @return 影响行数
+     */
+    default int insertOrUpdateSelective(OpsOrderCleanExtDO entity) {
+        OpsOrderCleanExtDO existing = selectByOpsOrderId(entity.getOpsOrderId());
+        if (existing == null) {
+            return insert(entity);
+        } else {
+            entity.setId(existing.getId());
+            // 保留首次下发时间
+            if (existing.getFirstDispatchedTime() != null && entity.getFirstDispatchedTime() != null) {
+                entity.setFirstDispatchedTime(existing.getFirstDispatchedTime());
+            }
+            return updateById(entity);
+        }
+    }
+
 }