feat(frontend): HashRouter->BrowserRouter 干净URL可独立索引 + 静态预渲染(SSR注入#root/robots/sitemap) + logo回顶

frontend/src/pages/front/PricingPage.tsx

@@ -209,7 +209,7 @@ const PricingPage: React.FC = () => {
         setShowModal(null);
         // 跳转到聊天页面，带定制服务ID
         setTimeout(() => {
-          window.location.hash = '#/chat?service_id=' + res.data.id;
+          window.location.href = '/chat?service_id=' + res.data.id;
         }, 1500);
       }
     } catch (e: any) {