feat(Sidebar): update navigation items order and icons

src/components/Layout/Sidebar.tsx

@@ -2,13 +2,14 @@ import { Box, List, ListItemButton, ListItemText, Typography, Collapse, ListItem
 import { Link, useLocation, useNavigate } from 'react-router-dom';
 import {
   LibraryBooksOutlined as KnowledgeBasesIcon,
-  AccountTreeOutlined as AgentIcon,
+  SmartToyOutlined as AgentsIcon,
+  AutoAwesomeOutlined as ModelsIcon,
+  HubOutlined as McpIcon,
   SettingsOutlined as SettingIcon,
   Person as PersonIcon,
   Group as GroupIcon,
   ExpandMore as ExpandMoreIcon,
   ExpandLess as ExpandLessIcon,
-
 } from '@mui/icons-material';
 import { useTranslation } from 'react-i18next';
 import { useMemo, useState } from 'react';
@@ -32,10 +33,11 @@ const Sidebar = () => {
   const { t } = useTranslation();
 
   const navItems: MenuItem[] = useMemo(() => ([
+    // 顺序：模型 -> 知识库 -> MCP -> 智能体 -> 设置
+    { text: t('header.models'), path: '/models', icon: ModelsIcon },
     { text: t('header.knowledgeBase'), path: '/knowledge', icon: KnowledgeBasesIcon },
-    { text: t('header.agents'), path: '/agents', icon: AgentIcon },
-    { text: t('header.models'), path: '/models', icon: AgentIcon },
-    { text: t('header.mcp'), path: '/mcp', icon: AgentIcon },
+    { text: t('header.mcp'), path: '/mcp', icon: McpIcon },
+    { text: t('header.agents'), path: '/agents', icon: AgentsIcon },
     {
       text: t('header.setting'),
       path: '/setting',