T4-038: User segment analytics — track funnel

Track: 4 — Telegram Mini App
Section: Phase D: Viral Growth Mechanics (32h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T4-038-user-funnel-analytics
Estimated Hours: 3h

Done When

Track: mini app opens, challenge joins, challenge completions, wallet connects, main app conversions. Daily metrics

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