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/utils/api.ts

@@ -75,4 +75,5 @@ export default {
   getAllParentFolder: `${api_host}/file/all_parent_folder`,
   createFolder: `${api_host}/file/create`,
   connectFileToKnowledge: `${api_host}/file2document/convert`,
+  getFile: `${api_host}/file/get`,
 };