1. Add 登陆功能

2. 调整字体大小
3. 新增部分功能

frontend/src/pages/RagChat/RagChatPage.tsx

@@ -2,6 +2,12 @@ import { useState, useRef, useEffect, useCallback } from 'react';
 import { Topbar } from '../../components/layout/Topbar';
 import { Send, Download } from 'lucide-react';
 
+const TOKEN_KEY = 'auth_token';
+function authHeader(): Record<string, string> {
+  const t = localStorage.getItem(TOKEN_KEY);
+  return t ? { Authorization: `Bearer ${t}` } : {};
+}
+
 interface Message {
   id: string;
   role: 'user' | 'assistant';
@@ -87,7 +93,7 @@ export function RagChatPage() {
 
   // Fetch quick questions from backend on mount
   useEffect(() => {
-    fetch('/api/v1/rag/quick-questions')
+    fetch('/api/v1/rag/quick-questions', { headers: authHeader() })
       .then(r => r.json())
       .then(d => {
         if (Array.isArray(d?.questions) && d.questions.length > 0) {
@@ -136,7 +142,7 @@ export function RagChatPage() {
 
       const res = await fetch('/api/v1/rag/chat', {
         method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
+        headers: { 'Content-Type': 'application/json', ...authHeader() },
         body: JSON.stringify(body),
         signal: ctrl.signal,
       });