T4-039: Push re-engagement — bot messages for inactive users

Track: 4 — Telegram Mini App
Section: Phase D: Viral Growth Mechanics (32h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T4-039-reengagement-messages
Estimated Hours: 2h

Done When

Users inactive 3+ days get bot message: "Your friends are ahead! Join today's challenge." Configurable frequency, opt-out

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