fix: 公开接口401错误不应跳转登录页

- 扩展公开接口列表，包括 products/categories/brands/banners/articles/lotteries
- 公开接口的401错误静默处理，不跳转登录页
- 修复商品详情页未登录时跳转登录的问题

frontend/src/utils/request.ts

@@ -28,7 +28,14 @@ api.interceptors.response.use(
     if (error.response?.status === 401) {
       const isLoginRequest = error.config?.url?.includes('/auth/login')
       const isRegisterRequest = error.config?.url?.includes('/auth/register')
-      const isPublicRequest = error.config?.url?.includes('/settings/public') || error.config?.url?.includes('/installed')
+      const isPublicRequest = error.config?.url?.includes('/settings/public') || 
+        error.config?.url?.includes('/installed') ||
+        error.config?.url?.includes('/products') ||
+        error.config?.url?.includes('/categories') ||
+        error.config?.url?.includes('/brands') ||
+        error.config?.url?.includes('/banners') ||
+        error.config?.url?.includes('/articles') ||
+        error.config?.url?.includes('/lotteries')
 
       if (isLoginRequest || isRegisterRequest) {
         ElMessage.error(message)
@@ -38,7 +45,8 @@ api.interceptors.response.use(
         ElMessage.error('请先登录')
         router.push('/login')
       } else {
-        ElMessage.error(message)
+        // 公开接口的 401 错误静默处理，不跳转登录
+        console.warn('Public API 401:', error.config?.url)
       }
     } else {
       ElMessage.error(message)