analytics: missing-history audit + lightning->liquid arb finder

audit-missing-history.ts: read-only audit classifying every user's payment
history as clean / recoverable (record in arc not db) / lost (gone from
both). Full-scan finding: of 6,330 users with history, 77% are "arc-only"
which is the NORMAL archived state — the payments route reads via gf()
(archive fallback) so those render fine in the app. True loss is 58 users
/ 59 records (0.02%). So there is no widespread history loss; "missing
history" reports are almost always either dropped receive-callbacks
(record never written, like apk403's 1100 sats) or one of the rare 59.

ln-liquid-arb.ts: finds users funding via lightning and withdrawing via
liquid (the pattern draining the liquid hot wallet / forcing threshold
cuts). Reports per-user through-flow + net liquid drainers.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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