win.40 - quieter INFO logging

Log-level scrub: the per-block sync ticker, the 20-min keepalive 'Reported online' line, and the 10-min '100% coverage' line are now DEBUG, so INFO mode stays sparse (startup + real status/warnings only). Press [L] for the full DEBUG detail. Includes win.39 (pool node list with IPs + self-check) and win.38 (donation treasury, NAT-tolerant payouts).