fix: 修复Task.java缩进和duration字段一致性

zxyj-backend/src/main/java/com/zxyj/service/TaskService.java

@@ -112,6 +112,7 @@ public class TaskService implements TaskServiceInterface {
         task.setTitle(dto.getTitle());
         task.setDescription(dto.getDescription());
         task.setPoints(dto.getPoints() != null ? dto.getPoints() : 2);
+        task.setDuration(dto.getDuration());
 
         // 处理小游戏任务
         task.setMinigameCode(dto.getMinigameCode());