root e54efdacee fix(knowledge): enforce upload type and size limits on client
Why: 添加知识库弹窗只在 hint 文案里写了「docx/pdf/txt/md/xls/xlsx,<=30M」,
beforeUpload 没做校验,用户可以提交任意大小、任意格式的文件后再被后端拒绝。
现在前端按白名单扩展名 + 30MB 阈值拦截,并给 dragger 加 accept 让系统选择器
默认过滤非法格式。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-08 18:42:14 +08:00
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