fix: Separate EPUB files into dedicated book file extension category

src/renderer/src/pages/knowledge/KnowledgeContent.tsx

@@ -18,7 +18,7 @@ import { useKnowledge } from '@renderer/hooks/useKnowledge'
 import FileManager from '@renderer/services/FileManager'
 import { getProviderName } from '@renderer/services/ProviderService'
 import { FileType, FileTypes, KnowledgeBase } from '@renderer/types'
-import { documentExts, textExts } from '@shared/config/constant'
+import { bookExts, documentExts, textExts } from '@shared/config/constant'
 import { Alert, Button, Card, Divider, message, Tag, Tooltip, Typography, Upload } from 'antd'
 import { FC } from 'react'
 import { useTranslation } from 'react-i18next'
@@ -35,7 +35,7 @@ interface KnowledgeContentProps {
   selectedBase: KnowledgeBase
 }
 
-const fileTypes = [...documentExts, ...textExts]
+const fileTypes = [...bookExts, ...documentExts, ...textExts]
 const KnowledgeContent: FC<KnowledgeContentProps> = ({ selectedBase }) => {
   const { t } = useTranslation()
 
@@ -217,7 +217,7 @@ const KnowledgeContent: FC<KnowledgeContentProps> = ({ selectedBase }) => {
           style={{ marginTop: 10, background: 'transparent' }}>
           <p className="ant-upload-text">{t('knowledge.drag_file')}</p>
           <p className="ant-upload-hint">
-            {t('knowledge.file_hint', { file_types: fileTypes.slice(0, 5).join(', ').replaceAll('.', '') })}
+            {t('knowledge.file_hint', { file_types: fileTypes.slice(0, 6).join(', ').replaceAll('.', '') })}
           </p>
         </Dragger>
       </FileSection>