feat: implement RAG dashboard with MUI and react-router

Add new RAG dashboard feature including:
- Main application layout with header and sidebar
- Multiple pages (Home, KnowledgeBase, PipelineConfig, Dashboard, MCP)
- Theme configuration and styling
- Routing setup with protected routes
- Login page and authentication flow
- Various UI components and mock data for dashboard views

src/routes/index.tsx

@@ -0,0 +1,32 @@
+import { Routes, Route, Navigate } from 'react-router-dom';
+import MainLayout from '../components/Layout/MainLayout';
+import Login from '../pages/Login';
+import Home from '../pages/Home';
+import KnowledgeBaseList from '../pages/KnowledgeBaseList';
+import PipelineConfig from '../pages/PipelineConfig';
+import Dashboard from '../pages/Dashboard';
+import ModelsResources from '../pages/ModelsResources';
+import MCP from '../pages/MCP';
+
+const AppRoutes = () => {
+  return (
+    <Routes>
+      <Route path="/login" element={<Login />} />
+      
+      {/* 使用MainLayout作为受保护路由的布局 */}
+      <Route path="/" element={<MainLayout />}>
+        <Route index element={<Home />} />
+        <Route path="kb-list" element={<KnowledgeBaseList />} />
+        <Route path="pipeline-config" element={<PipelineConfig />} />
+        <Route path="dashboard" element={<Dashboard />} />
+        <Route path="models-resources" element={<ModelsResources />} />
+        <Route path="mcp" element={<MCP />} />
+      </Route>
+      
+      {/* 处理未匹配的路由 */}
+      <Route path="*" element={<Navigate to="/" replace />} />
+    </Routes>
+  );
+};
+
+export default AppRoutes;