refactor: 改用router.push并清除路由守卫缓存替代window.location.href

- 添加resetInstallCheck()清除安装状态缓存
- 安装完成后调用resetInstallCheck再router.push跳转
- 保持SPA无刷新体验

frontend/src/router/guard/index.ts

@@ -3,6 +3,11 @@ import type { Router } from 'vue-router'
 let installChecked = false
 let isInstalled = false
 
+export function resetInstallCheck() {
+  installChecked = false
+  isInstalled = false
+}
+
 async function checkInstallStatus(): Promise<boolean> {
   if (installChecked) return isInstalled
   try {