T4-021: Weekly challenge templates — auto-create recurring challenges¶

Track: 4 — Telegram Mini App
Section: Phase B: Health Challenges (40h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T4-021-weekly-challenge-templates
Estimated Hours: 2h

Done When¶

System creates weekly challenges automatically: "10K Steps Challenge", "Sleep 8h Challenge". Always something to join

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