优化任务状态投影和部署文档

apps/backend/src/services/admin/write/task-actions.ts

@@ -3,6 +3,7 @@ import { updateTask } from '../../../repositories/task-repo.js'
 import { createTaskEvent } from '../../../repositories/task-event-repo.js'
 import { createHttpError } from '../../../utils/http.js'
 import { nowIso } from '../../../utils/time.js'
+import { TASK_STATUS } from '../../../domain/task-status.js'
 import {
   canViewerCloseTask,
   createAdminViewerContext,
@@ -44,7 +45,7 @@ export async function closeAdminTask(
   }
 
   const updatedTask = await updateTask(task.id, {
-    task_status: 'closed',
+    task_status: TASK_STATUS.CLOSED,
     delivery_status: 'closed',
     result_code: 'closed_by_admin',
     result_message: '任务已关闭，领取链接已失效',