fix(wechat): cancel sole active scheduled task in inbound without Goose

When a user has exactly one active automation task, cancel it by taskId
after listTasks instead of relying on Goose when the LLM provider fails.

Co-authored-by: Cursor <cursoragent@cursor.com>

scheduled-task-intent.mjs

@@ -332,6 +332,11 @@ export function formatScheduledTaskListReply(tasks = []) {
   return lines.join('\n');
 }
 
+export function formatScheduledTaskCancelReply(task) {
+  const title = String(task?.title ?? '定时任务').trim();
+  return `已取消定时任务：${title}`;
+}
+
 export {
   extractScheduledTaskSpec,
   isMetaScheduledTaskSpec,