Add help text for university which doesn't have program added

[cuttle-fish-my]

Currently, when users search on the program page and no university or program matches their query, the page displays nothing. This can be misleading: a new user might assume the university is not included in our database and stop looking further.

To address this, we can display a helpful message — for example, “暂无项目记录，点击添加” — for universities that are listed in UnivList.json but currently have no associated programs.