feat: RAG Integration (#238)

* feat: add rag provider and retriever

* feat: retriever tool

* feat: add retriever tool to the researcher node

* feat: add rag http apis

* feat: new message input supports resource mentions

* feat: new message input component support resource mentions

* refactor: need_web_search to need_search

* chore: RAG integration docs

* chore: change example api host

* fix: user message color in dark mode

* fix: mentions style

* feat: add local_search_tool to researcher prompt

* chore: research prompt

* fix: ragflow page size and reporter with

* docs: ragflow integration and add acknowledgment projects

* chore: format

web/src/core/api/rag.ts

@@ -0,0 +1,24 @@
+import type { Resource } from "../messages";
+
+import { resolveServiceURL } from "./resolve-service-url";
+
+export function queryRAGResources(query: string) {
+  return fetch(resolveServiceURL(`rag/resources?query=${query}`), {
+    method: "GET",
+  })
+    .then((res) => res.json())
+    .then((res) => {
+      return res.resources as Array<Resource>;
+    })
+    .catch((err) => {
+      return [];
+    });
+}
+
+export function getRAGConfig() {
+  return fetch(resolveServiceURL(`rag/config`), {
+    method: "GET",
+  })
+    .then((res) => res.json())
+    .then((res) => res.provider);
+}