fix: 移除安装状态永久缓存，修复数据库重置后无法跳转安装页；优化登录401错误提示

frontend/src/router/index.ts

@@ -75,15 +75,12 @@ const router = createRouter({
   routes,
 })
 
-let installedChecked = false
 let isInstalled = false
 
 async function checkInstalled() {
-  if (installedChecked) return isInstalled
   try {
     const res: any = await systemApi.checkInstalled()
     isInstalled = res.installed
-    installedChecked = true
     return isInstalled
   } catch {
     return true

frontend/src/utils/request.ts

@@ -26,14 +26,19 @@ api.interceptors.response.use(
   (error) => {
     const message = error.response?.data?.error || error.message || 'Request failed'
     if (error.response?.status === 401) {
-      const hadToken = !!localStorage.getItem('token')
+      const isLoginRequest = error.config?.url?.includes('/auth/login')
-      localStorage.removeItem('token')
+      if (isLoginRequest) {
-      localStorage.removeItem('user')
-      if (hadToken) {
-        ElMessage.error('登录已过期，请重新登录')
-        router.push('/login')
-      } else {
         ElMessage.error(message)
+      } else {
+        const hadToken = !!localStorage.getItem('token')
+        localStorage.removeItem('token')
+        localStorage.removeItem('user')
+        if (hadToken) {
+          ElMessage.error('登录已过期，请重新登录')
+          router.push('/login')
+        } else {
+          ElMessage.error(message)
+        }
       }
     } else {
       ElMessage.error(message)