fix: prevent full page reload on login failure (401 on /auth/login)

The axios 401 interceptor was redirecting to /login for every 401 response,
including failed login attempts. Now it skips the redirect when the request
is to /auth/login, letting the LoginView handle the error gracefully.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

WebUI/src/api/request.ts

@@ -28,6 +28,9 @@ instance.interceptors.response.use(
           message = data?.detail || '请求参数有误，请检查一下~'
           break
         case 401:
+          if (error.config?.url?.includes('/auth/login')) {
+            break
+          }
           message = '登录状态已失效~'
           window.location.href = '/login'
           return Promise.reject(error)