T4-033: Group challenges — create challenge in Telegram group

Track: 4 — Telegram Mini App
Section: Phase D: Viral Growth Mechanics (32h)
Status: [ ] Todo
Repo: backend-api + telegram-mini-app
Branch: feature/T4-033-group-challenges
Estimated Hours: 4h

Done When

Bot can be added to groups. /challenge command creates group challenge. All group members can join

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