Function apply_power 

pub async fn apply_power(
    infra: &InfraContext<'_>,
    token: &str,
    params: &ApplyPowerParams,
) -> Result<TransitionStartOutput, Error>

Start a PCS power transition (on, soft-off, force-off, soft-restart, hard-restart) against params.xnames and return the transition id immediately. The CLI is responsible for polling get_power_transition until the transition reports completed.

params.force only changes the wire-level PCS operation for Off and Reset — it’s ignored for On, matching today’s behaviour. See pcs_operation (crate-private) for the exact mapping.

Errors

• [Error::BadRequest] when the caller lacks access to one of params.xnames.
• Backend errors from pcs_transitions_post (PCS upstream failure, unknown xname, etc.).