feat: [WIP] implement scp by bgo

app.go

@@ -340,12 +340,16 @@ func (a *App) runSaveRemotePipeline(pngBytes []byte) error {
 		"auth_method", cfg.SSH.AuthMethod, "png_size", len(pngBytes))
 
 	// Select the uploader by auth method: Kerberos delegates to the system
-	// ssh/scp binaries (reusing the kinit credential cache), while builtin
-	// uses the in-process Go SSH client.
+	// ssh/scp binaries (reusing the kinit credential cache), bgo delegates to
+	// the internal `bgo scp` client (under a PTY), while builtin uses the
+	// in-process Go SSH client.
 	var uploader application.SSHUploader
-	if cfg.SSH.IsKerberos() {
+	switch {
+	case cfg.SSH.IsKerberos():
 		uploader = sshpkg.NewKerberosUploader(cfg.SSH)
-	} else {
+	case cfg.SSH.IsBgo():
+		uploader = sshpkg.NewBgoUploader(cfg.SSH)
+	default:
 		uploader = sshpkg.NewUploader(cfg.SSH)
 	}
 
@@ -467,6 +471,15 @@ func (a *App) TestSSHConnection(cfg domain.SSHConfig) error {
 		}
 		return nil
 	}
+	// bgo manages its own auth; we can only confirm the binary is installed
+	// and resolvable (a real transfer would need a live remote + PTY).
+	if cfg.IsBgo() {
+		if err := sshpkg.TestBgoConnection(a.ctx, cfg); err != nil {
+			slog.Error("RPC TestSSHConnection (bgo) failed", "err", err)
+			return err
+		}
+		return nil
+	}
 	if err := sshpkg.TestConnection(a.ctx, cfg); err != nil {
 		slog.Error("RPC TestSSHConnection failed", "err", err)
 		return err