修复下载信息，清除部分日志

backend/auth.js

@@ -124,23 +124,16 @@ class PixivAuth {
         include_policy: true
       };
 
-      console.log('请求数据:', data);
-
       const headers = {
         ...this.getDefaultHeaders(),
         'Content-Type': 'application/x-www-form-urlencoded'
       };
 
-      console.log('请求头部:', headers);
-
       const response = await this.axiosInstance.post('https://oauth.secure.pixiv.net/auth/token', 
         stringify(data),
         { headers }
       );
 
-      console.log('响应状态:', response.status);
-      console.log('响应数据:', JSON.stringify(response.data, null, 2));
-
       const tokenData = response.data.response;
       
       this.accessToken = tokenData.access_token;