sendLightning / finalize: drop chatty per-send INFO logs

Each successful lightning send was emitting 5 INFO lines:
  "<user> sent lightning <amount>"          (debit, KEEP)
  "paying lightning invoice <pr> <amt> <fee>"  (drop — redundant)
  "payment completed <id> <preimage>"       (drop — implicit from absence of warns)
  "refunding fee <maxfee> <fee> <delta> <ref>"  (drop — the warn for non-integer
                                                 delta already covers anomalies)
  "sendLightning outcome <id> = finalized"  (drop for "finalized" only —
                                              keep for the recovery-via-fallback
                                              variants since those are diagnostic)

Net: only the "<user> sent lightning <amount>" line fires per healthy send,
matching the other asset types' style. Anything that needed a fallback path
or threw still surfaces via the existing warn/err lines.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

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