优化仪表板页面，移除冗余组件，简化代码结构

atsf_server/web/app/(dashboard)/page.tsx

@@ -1,13 +1,8 @@
 import { DashboardOverview } from '@/features/dashboard/components/dashboard-overview';
-import { PageHeader } from '@/components/layout/page-header';
 
 export default function DashboardPage() {
   return (
     <div className='space-y-6'>
-      <PageHeader
-        title='ATSFlare 管理端'
-        description='集中展示系统核心数据概览，快速导航至各功能模块进行管理和配置。'
-      />
       <DashboardOverview />
     </div>
   );

atsf_server/web/app/layout.tsx

@@ -20,8 +20,8 @@ interface RootLayoutProps {
   children: ReactNode;
 }
 
-export default function RootLayout({ children }: RootLayoutProps) {
-  return (
+export default function RootLayout({ children }: RootLayoutProps) {
+  return (
     <html lang='zh-CN' suppressHydrationWarning>
       <body>
         <Script id='theme-init' strategy='beforeInteractive'>
@@ -30,5 +30,5 @@ export default function RootLayout({ children }: RootLayoutProps) {
         <AppProviders>{children}</AppProviders>
       </body>
     </html>
-  );
-}
+  );
+}