Add infrastructure/sweep.conf as a default config template with
COLD_ADDRESS, KEEP_SATS (300000), and MIN_SWEEP (50000). Update
setup.sh to copy this template to /opt/timmy-node/ during bootstrap
(preserving any existing config from lnd-init.sh).
Fixes#41
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>