fix(login): 修复登录后跳转及认证拦截问题

- request.ts: 优化401处理，避免登录接口误判过期
- router/index.ts: 路由守卫增加用户信息获取
- stores/user.ts: fetchUserInfo增强错误处理，login前先清理旧状态
- Login.vue: 使用await router.push，避免重复报错
- user_service.py: bootstrap superuser密码同步

frontend/src/router/index.ts

@@ -129,7 +129,7 @@ const router = createRouter({
   routes,
 })
 
-router.beforeEach((to, from, next) => {
+router.beforeEach(async (to, from, next) => {
   const userStore = useUserStore()
   
   // Public routes (login)
@@ -143,13 +143,27 @@ router.beforeEach((to, from, next) => {
     next('/login')
     return
   }
+
+  if (!userStore.userInfo) {
+    try {
+      const userInfo = await userStore.fetchUserInfo()
+      if (!userInfo) {
+        userStore.logout()
+        next('/login')
+        return
+      }
+    } catch {
+      next('/login')
+      return
+    }
+  }
   
   // Check role permissions
   const allowedRoles = to.meta.roles as string[] | undefined
   if (allowedRoles && allowedRoles.length > 0) {
     const hasPermission = userStore.hasAnyRole(allowedRoles)
     if (!hasPermission) {
-      next('/dashboard')
+      next(to.path === '/dashboard' ? '/login' : '/dashboard')
       return
     }
   }