Auto-discover jails and add WireGuard peer info to status page

Replace the per-jail check scripts with checks/jails.sh, which lists
running jails via jls and resolves each one's IPv4 (falling back to
jexec+ifconfig for VNET jails, which don't set the ip4.addr jail
parameter). New jails now show up without adding a script; the
trade-off is a stopped jail just disappears rather than showing down,
since jls only lists what's running.

checks/wireguard.sh now also reports each configured peer's allowed-IP
and time since last handshake, parsed from `wg show wg0 dump`.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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