feat!: Refactor batch import task to transfer task

- Updated command usage in English and Simplified Chinese localization files to reflect changes in transfer command syntax.
- Removed batch import task implementation, replacing it with a new transfer task implementation.
- Introduced new task structure and progress tracking for file transfers.
- Updated task type enumeration to replace batch import with transfer.
- Added new fields in data structures to support transfer operations.
- Implemented file handling and progress reporting for the transfer task.

client/bot/handlers/add_task.go

@@ -101,6 +101,8 @@ func handleAddCallback(ctx *ext.Context, update *ext.Update) error {
 		shortcut.CreateAndAddAria2TaskWithEdit(ctx, selectedStorage, dirPath, data.Aria2URIs, client, msgID, userID)
 	case tasktype.TaskTypeYtdlp:
 		shortcut.CreateAndAddYtdlpTaskWithEdit(ctx, selectedStorage, dirPath, data.YtdlpURLs, data.YtdlpFlags, msgID, userID)
+	case tasktype.TaskTypeTransfer:
+		return handleTransferCallback(ctx, userID, selectedStorage, dirPath, data, msgID)
 	default:
 		return fmt.Errorf("unexcept task type: %s", data.TaskType)
 	}