feat: order processing

feat: order commands result save/load

internal/repo/repo.go

@@ -28,6 +28,7 @@ type Storage interface {
 	Lock() (func() error, error)
 	Exists(string) (bool, error)
 	Write(string, encoding.BinaryMarshaler) error
+	WriteSafe(string, encoding.BinaryMarshaler) error
 	Read(string, encoding.BinaryUnmarshaler) error
 	ReadSafe(string, encoding.BinaryUnmarshaler) error
 }