feat(knowledgeBase): add media file validation and PDF enhancement method selection

- Add i18n translations for file size and duration validation errors in English and Chinese
- Implement media file validation with 256MB size limit and 150-second duration limit
- Add support for audio and video file formats (mp3, mp4, mov, wav) in dataset creation
- Add checkMediaDuration helper function to validate media file duration using HTML5 media API
- Add PDF enhancement method selection dropdown with options (DeepDoc, MinerU, TextLN)
- Change default PDF enhancement setting from disabled to enabled
- Update file type array to include media formats
- Add error messaging for file size and duration validation failures
- Improve UI spacing for file parsing settings section

web/src/i18n/zh.ts

@@ -239,6 +239,11 @@ export const zh = {
       qaMode: '问答模式',
       fileParsingSettings: '文件解析设置',
       pdfEnhancementAnalysis: 'PDF增强解析',
+      fileSizeExceeds: '文件大小超过限制',
+      sizeLimitError: '文件大小超过限制，最大支持256MB，当前文件大小',
+      fileDurationExceeds:'文件时长超过限制',
+      fileDurationLimitError: '媒体文件时长超过限制，最大支持150秒，当前时长',
+      unableReadFile:'无法读取媒体文件信息，请检查文件格式',
       createForm: {
         name: '名称',
         embedding_id: '嵌入模型',