Supports obtaining PDF documents from web pages (#1107)

### What problem does this PR solve?

Knowledge base management supports crawling information from web pages
and generating PDF documents

### Type of change
- [x] New Feature (Support document from web pages)

web/src/utils/api.ts

@@ -48,6 +48,7 @@ export default {
   document_thumbnails: `${api_host}/document/thumbnails`,
   get_document_file: `${api_host}/document/get`,
   document_upload: `${api_host}/document/upload`,
+  web_crawl: `${api_host}/document/web_crawl`,
 
   // chat
   setDialog: `${api_host}/dialog/set`,