feat: support DeepSeek (#667)

### What problem does this PR solve?

#666 
feat: support DeepSeek
feat: preview word and excel

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/constants/common.ts

@@ -46,3 +46,25 @@ export const LanguageTranslationMap = {
   Chinese: 'zh',
   'Traditional Chinese': 'zh-TRADITIONAL',
 };
+
+export const FileMimeTypeMap = {
+  bmp: 'image/bmp',
+  csv: 'text/csv',
+  odt: 'application/vnd.oasis.opendocument.text',
+  doc: 'application/msword',
+  docx: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+  gif: 'image/gif',
+  htm: 'text/htm',
+  html: 'text/html',
+  jpg: 'image/jpg',
+  jpeg: 'image/jpeg',
+  pdf: 'application/pdf',
+  png: 'image/png',
+  ppt: 'application/vnd.ms-powerpoint',
+  pptx: 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
+  tiff: 'image/tiff',
+  txt: 'text/plain',
+  xls: 'application/vnd.ms-excel',
+  xlsx: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+  mp4: 'video/mp4',
+};