Bug: Missing cleanup for ESP serial client

[tuanvumaihuynh]

raybot/internal/application/application.go

Lines 120 to 130 in 025cf49

	// cleanup function
	cleanup := func() error {
	if err := app.CleanupManager.Cleanup(app.ctx); err != nil {
	return fmt.Errorf("cleanup manager cleanup failed: %w", err)
	}
	if err := app.PICSerialClient.Stop(); err != nil {
	return fmt.Errorf("failed to close pic serial client: %w", err)
	}
	return nil