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Adds optional peer-to-peer zone_data replication between directdnsonly instances. Enables eventual consistency in DA Multi-Server topologies without a shared datastore. - InternalAPI: GET /internal/zones (list) and ?domain= (detail) exposes zone_data to peers via existing basic auth - PeerSyncWorker: interval-based daemon thread that fetches zone_data from configured peers, storing newer entries locally; peer downtime is silently skipped and retried next interval - WorkerManager: wires PeerSyncWorker alongside reconciler; exposes peer_syncer_alive in queue_status - Config: peer_sync block with enabled/interval_minutes/peers[] - Tests: 13 tests covering sync, skip-older, skip-unreachable, empty peer list, bad status, and missing zone_data scenarios