Leader 与 Candidate 配对

sequenceDiagram
actor L as Leader
participant LP as Leader Pairing
participant T as Transport
participant MP as Member Pairing
actor M as Member
L->>LP: start
LP->>T: PairRequest
T->>MP: request
MP-->>M: confirm?
M->>MP: confirm
MP->>T: PairConfirm
T->>LP: confirmed
LP->>T: KeyDist
T->>MP: keys