Revert "Refa: Chats /chat API to RESTFul (#13871)" (#13877)

### What problem does this PR solve?

This reverts commit 1a608ac411.

### Type of change

- [x] Other (please describe):

web/src/components/knowledge-base-item.tsx

@@ -67,7 +67,7 @@ export function useDisableDifferenceEmbeddingDataset(name: string) {
 
 export function KnowledgeBaseFormField({
   showVariable = false,
-  name = 'dataset_ids',
+  name = 'kb_ids',
   required = false,
 }: {
   showVariable?: boolean;