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* [client] Index peer tunnel IPs for O(1) PeerStateByIP lookup Replace the linear scan over all peers with an ipToKey map maintained by AddPeer/RemovePeer, covering both IPv4 and IPv6 tunnel addresses. Offline peers are intentionally no longer resolvable by IP: only active peers can carry traffic, so IdentityForIP and the DNS disconnected-peer filter now treat them as unknown, same as foreign IPs. Skip the DNS answer filter for single-record responses; dropping the only answer was always restored by the empty-answer escape hatch, so the fast path is behavior-neutral. * Ensure `ipToKey` entries are only removed if they match the peer being deleted, preventing accidental removal of unrelated mappings.