fix(web): update admin base href to /admin/dashboard

Web/src/layouts/components/Header.tsx

@@ -77,7 +77,7 @@ const Header: React.FC<HeaderProps> = ({
         
         const currentPath = location.pathname;
         const isAdminArea = routeInfo?.area === 'admin';
-        const baseHref = isAdminArea ? '/admin' : '/';
+        const baseHref = isAdminArea ? '/admin/dashboard' : '/';
         const baseTitle = isAdminArea ? '管理后台' : '首页';
 
         if (currentPath === baseHref && !explicitTitle && (!routeInfo || routeInfo.path === '')) {

Web/src/routes/index.tsx

@@ -127,7 +127,7 @@ const routes: RouteConfig[] = [
 
   // 管理后台路由
   {
-    path: '',
+    path: 'dashboard',
     key: 'admin-dashboard',
     icon: <DashboardOutlined />,
     label: '控制面板',