T4-030: Invite system — unique referral links per user

Track: 4 — Telegram Mini App
Section: Phase D: Viral Growth Mechanics (32h)
Status: [ ] Todo
Repo: backend-api + telegram-mini-app
Branch: feature/T4-030-invite-referral-links
Estimated Hours: 4h

Done When

Each user gets unique invite link. Track: who invited whom, conversion count. Display invite stats

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