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/services/kbService.ts

@@ -26,6 +26,7 @@ const {
   document_run,
   get_document_file,
   document_upload,
+  web_crawl,
 } = api;
 
 const methods = {
@@ -87,6 +88,10 @@ const methods = {
     url: document_upload,
     method: 'post',
   },
+  web_crawl: {
+    url: web_crawl,
+    method: 'post',
+  },
   // chunk管理
   chunk_list: {
     url: chunk_list,