scripts: stubborn peer-force LN payer + boltz stuck-swap recovery

Add scripts/pay-hard.ts: a payment helper for well-connected but inbound-scarce
destinations (exchange nodes) that cost-first payers (xpay/renepay) can't reach.
When the normal xpay attempt fails, it enumerates the destination's peers, keeps
the ones we can reach (preferring peers we already channel with enough outbound),
and for each builds a route forced through peer->dest with the invoice's correct
final CLTV, probes it with an unclaimable random hash, and pays through the first
path that reaches the destination. Probe-before-send, refuses to start with a
payment already pending, and stops rather than risk a second in-flight payment.
Works against either the main node (cl) or the boltz node (bcln).

Add scripts/boltz-recover-stuck.ts: a cron watcher that finds submarine swaps
stuck at invoice.pending (lockup confirmed, invoice unexpired, idle past a
threshold) and runs pay-hard against bcln to complete them, then lets boltz
reconcile (restarting it only if it hasn't picked up the preimage within a grace
period).

Co-Authored-By: Claude Opus 4.8 <[email protected]>
Claude-Session: https://claude.ai/code/session_01DKkev76U4YRnRAqM6jqbae

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