feat: [WIP] implement scp by bgo

internal/application/capture_ssh.go

@@ -69,6 +69,12 @@ func (s *CaptureAndSSHService) ExecuteWithBytes(ctx context.Context, pngBytes []
 		return fmt.Errorf("empty screenshot")
 	}
 	relPath := buildRemoteRelPath(s.Cfg.PathPrefix)
+	// bgo cannot create remote directories, so it uploads flat into the
+	// remote $HOME with a timestamped filename rather than a date-grouped
+	// subdirectory tree (see BgoUploader for the rationale).
+	if s.Cfg.IsBgo() {
+		relPath = buildRemoteFlatName()
+	}
 	sshSvcLog().Info("save-remote pipeline start",
 		"host", s.Cfg.Host, "user", s.Cfg.User, "port", s.Cfg.Port,
 		"size", len(pngBytes), "remote_path", relPath,
@@ -128,6 +134,17 @@ func buildRemoteRelPath(prefix string) string {
 	)
 }
 
+// buildRemoteFlatName produces a flat, timestamped filename (no directory
+// components) for destinations that cannot create remote directories, such
+// as the bgo client. The file lands directly in the remote $HOME.
+func buildRemoteFlatName() string {
+	now := time.Now()
+	return fmt.Sprintf("%s-%s.png",
+		now.Format("20060102-150405"),
+		randomSuffix(6),
+	)
+}
+
 func (s *CaptureAndSSHService) notifyFailure(reason string) {
 	if s.Notifier != nil {
 		s.Notifier.NotifyFailure(reason)