feat: Update publicationTitle handling in KeyExampleFactory

[wzh4464]

会议论文不应该用简单用publicationTitle. 这里选择的处理办法是先使用conferenceName, 如果没有的话再用proceedingTitle.

This commit updates the handling of the publicationTitle in the KeyExampleFactory class. It now checks the item type and retrieves the appropriate field value for the publication title. If the item type is journalArticle, it retrieves the publicationTitle field. If the item type is conferencePaper, it retrieves the conferenceName field. If the conferenceName field is not available, it retrieves the proceedingsTitle field. The retrieved value is then encoded using encodeURIComponent().

[redleafnew]

你都测试过了是吧，我没有多少精力维护了。

[wzh4464]

自己平台测试过了。辛苦辛苦啊。