T4-018: TWA create challenge — "Challenge a friend" flow

Track: 4 — Telegram Mini App
Section: Phase B: Health Challenges (40h)
Status: [ ] Todo
Repo: telegram-mini-app
Branch: feature/T4-018-twa-create-challenge
Estimated Hours: 4h

Done When

Create custom challenge: pick type, set target, invite friends via Telegram share. Deep link for joining

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