Function executar_tunnel 

pub async fn executar_tunnel(
    vps_nome: &str,
    porta_local: u16,
    host_remoto: &str,
    porta_remota: u16,
    config_override: Option<PathBuf>,
    password_override: Option<String>,
    key_override: Option<String>,
    timeout_ms: u64,
    replace_host_key: bool,
) -> Result<()>

Executa o subcomando tunnel com timeout obrigatório.