jianf eda9bb9597 feat: cluster reliability (leader failover, crash rejoin, key exchange) + auth/users + canvas/forwards enhancements + comprehensive README + API docs ...

- Cluster: forwardToNext offline detection (leader+non-leader), WatchLeader 1s heartbeat fallback, 409 for standalone nodes, Node.NodeKey key exchange via token ring, ClusterPeers persistence + auto-rejoin, Forward delegates to forwardToNext (bugfix)
- Auth: Basic Auth (flag-creds fast path) + bcrypt users (admin/viewer) + Bearer API keys (read/write/admin scope)
- Frontend: UsersView (accounts+API keys), ClusterView (ring/nodeKey/tasks/topology/log), StatusView (group management, per-proxy status), CanvasView (edge toggle/group), PortEdge (disabled/group labels)
- API: handlers split (canvas/forwards/users/logs), canvas export/import, forwards group start/stop/assign/delete, cluster endpoints
- Docs: comprehensive README rewrite (all flags/APIs/auth/cluster), docs/cluster-api.md (cluster management API reference)
- Deploy: run-cluster.sh now 4-node ring + 1 isolated standalone, test-forward.sh updated for 4 nodes
- Removed plan.md (design notes consolidated into README + API docs)

2026-08-19 21:09:24 +08:00

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