Repair higher-term stepdown and one-vote guards

Review the independently proposed patch below, including its unchanged callers. A higher term clears the previous vote. A second candidate in the same term must still be rejected after that reset. Repair both transition and vote policy.

Review focus: Consensus log transitions

src/services/terms.go

BeforeProposed

+1−0

88 if term > node.Term {

99 node.Term = term

1010 node.Role = "follower"

11 node.VotedFor = nil

1112 node.Matches = map[string]int{}

1213 }

1314}

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