feat: Add KnowledgeGraphModal #162 (#1766)

### What problem does this PR solve?

feat: Add KnowledgeGraphModal #162

### Type of change


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

web/src/services/knowledge-service.ts

@@ -27,6 +27,7 @@ const {
   get_document_file,
   document_upload,
   web_crawl,
+  knowledge_graph,
 } = api;
 
 const methods = {
@@ -121,6 +122,10 @@ const methods = {
     url: retrieval_test,
     method: 'post',
   },
+  knowledge_graph: {
+    url: knowledge_graph,
+    method: 'get',
+  },
 };
 
 const kbService = registerServer<keyof typeof methods>(methods, request);