Adds an optional `cluster_api_host` field to VpnConfig. When set, the
daemon resolves it against the netmap's peer list once the first
netmap arrives and uses that peer's tailnet IP as the proxy backend,
overriding the static `cluster_api_addr`. Falls back to the static
addr if the hostname doesn't match any peer.
The resolver tries hostname first, then peer name (FQDN), then a
prefix match against name. Picks v4 over v6 from the peer's address
list.
- sunbeam-net/src/config.rs: new `cluster_api_host: Option<String>`
- sunbeam-net/src/daemon/lifecycle.rs: resolve_peer_ip helper +
resolution at proxy bind time
- sunbeam-net/tests/integration.rs: pass cluster_api_host: None in
the existing VpnConfig literals
- src/config.rs: new context field `vpn-cluster-host`
- src/vpn_cmds.rs: thread it from context → VpnConfig
Sienna Meridian Satterwhite
e934eb45dc
