analytics: monthly insight reports + signup instrumentation

scripts/analytics.ts — streams live db (SCAN, never KEYS) and reports for
a trailing window (default 30d): MAU/WAU, new users, custody total + top
holders, network volume by type (lightning/liquid/bitcoin/internal/bolt12/
fund), most-active and highest-volume users, and bolt12 recipients with a
"regular" flag for the Ocean mining-reward stream.

scripts/analytics-geo.ts — top countries from the request log. Counts only
/login + /register events tied to a username (raw cf-ipcountry volume is
dominated by datacenter/nostr traffic). Surfaces a distinct-IP-per-country
column so proxy/VPN egress is visible, and filters a known credential-test
bot IP. Honest result: US #1, then GB/CA/JP/DE/ES/BR.

lib/register.ts — stamp `created` (ms epoch) and store `country` (CF/
ipregistry code) on new users, so future reports get real signup timing and
geography from the db directly instead of log archaeology. Existing users
predate this; backfill is out of scope.

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

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