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/hooks.ts

@@ -3,9 +3,12 @@
 
 import { useEffect, useRef, useState } from "react";
 
+import { env } from "~/env";
+
 import { useReplay } from "../replay";
 
 import { fetchReplayTitle } from "./chat";
+import { getRAGConfig } from "./rag";
 
 export function useReplayMetadata() {
   const { isReplay } = useReplay();
@@ -39,3 +42,26 @@ export function useReplayMetadata() {
   }, [isLoading, isReplay, title]);
   return { title, isLoading, hasError: error };
 }
+
+export function useRAGProvider() {
+  const [loading, setLoading] = useState(true);
+  const [provider, setProvider] = useState<string | null>(null);
+
+  useEffect(() => {
+    if (env.NEXT_PUBLIC_STATIC_WEBSITE_ONLY) {
+      setLoading(false);
+      return;
+    }
+    getRAGConfig()
+      .then(setProvider)
+      .catch((e) => {
+        setProvider(null);
+        console.error("Failed to get RAG provider", e);
+      })
+      .finally(() => {
+        setLoading(false);
+      });
+  }, []);
+
+  return { provider, loading };
+}