新增404页面路由处理，优化未匹配路径的用户体验。将默认重定向至NotFoundPage，以提升系统的可用性和用户友好性。

soul-admin/src/App.tsx

@@ -14,6 +14,7 @@ import { PaymentPage } from './pages/payment/PaymentPage'
 import { SitePage } from './pages/site/SitePage'
 import { QRCodesPage } from './pages/qrcodes/QRCodesPage'
 import { MatchPage } from './pages/match/MatchPage'
+import { NotFoundPage } from './pages/not-found/NotFoundPage'
 
 function App() {
   return (
@@ -35,7 +36,7 @@ function App() {
         <Route path="qrcodes" element={<QRCodesPage />} />
         <Route path="match" element={<MatchPage />} />
       </Route>
-      <Route path="*" element={<Navigate to="/dashboard" replace />} />
+      <Route path="*" element={<NotFoundPage />} />
     </Routes>
   )
 }

soul-admin/src/pages/not-found/NotFoundPage.tsx

@@ -0,0 +1,29 @@
+import { Link, useLocation } from 'react-router-dom'
+import { Home, AlertCircle } from 'lucide-react'
+import { Button } from '@/components/ui/button'
+
+export function NotFoundPage() {
+  const location = useLocation()
+
+  return (
+    <div className="min-h-screen bg-[#0a1628] flex items-center justify-center p-8">
+      <div className="text-center max-w-md">
+        <div className="inline-flex items-center justify-center w-20 h-20 rounded-full bg-red-500/20 text-red-400 mb-6">
+          <AlertCircle className="w-10 h-10" />
+        </div>
+        <h1 className="text-4xl font-bold text-white mb-2">404</h1>
+        <p className="text-gray-400 mb-1">页面不存在</p>
+        <p className="text-sm text-gray-500 font-mono mb-8 break-all">{location.pathname}</p>
+        <Button
+          asChild
+          className="bg-[#38bdac] hover:bg-[#2da396] text-white"
+        >
+          <Link to="/">
+            <Home className="w-4 h-4 mr-2" />
+            返回首页
+          </Link>
+        </Button>
+      </div>
+    </div>
+  )
+}