feat: add pikpak offline download function (#6648)

* add pikpak offline download function

* 完善PikPak离线下载功能

* 删除多余的代码

* add task cache to avoid too many requests about API

* 优化Status函数

* 完善所有功能,目前测试无BUG

* 减少缓存时间，优化添加离线任务的参数

internal/offline_download/tool/download.go

@@ -71,6 +71,9 @@ outer:
 	if err != nil {
 		return err
 	}
+	if t.tool.Name() == "pikpak" {
+		return nil
+	}
 	t.Status = "offline download completed, maybe transferring"
 	// hack for qBittorrent
 	if t.tool.Name() == "qBittorrent" {
@@ -123,6 +126,9 @@ func (t *DownloadTask) Complete() error {
 		files []File
 		err   error
 	)
+	if t.tool.Name() == "pikpak" {
+		return nil
+	}
 	if getFileser, ok := t.tool.(GetFileser); ok {
 		files = getFileser.GetFiles(t)
 	} else {
@@ -132,7 +138,7 @@ func (t *DownloadTask) Complete() error {
 		}
 	}
 	// upload files
-	for i, _ := range files {
+	for i := range files {
 		file := files[i]
 		TransferTaskManager.Add(&TransferTask{
 			file:         file,