审批界面增加pdf，图片预览功能

yangys

2025-11-27 f97351a6f1fdc679f4956030d179dca843bbeb0c

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@saber:registry=https://center.javablade.com/api/packages/blade/npm/
//center.javablade.com/api/packages/blade/npm/:_authToken=4d378be1380eab90b868001f41b76e7ec651769b