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.

pkg/tcbdata/data.go

@@ -50,6 +50,11 @@ type Add struct {
 	// ytdlp
 	YtdlpURLs  []string
 	YtdlpFlags []string
+	// transfer
+	TransferSourceStorName string
+	TransferSourcePath     string
+	TransferFiles          []string // file paths relative to source storage
+	TransferTargetPath     string
 }
 
 type SetDefaultStorage struct {