T4-005: User profile sync — Telegram user -> Sellwyse account

Track: 4 — Telegram Mini App
Section: Phase A: Bot & Mini App Foundation (24h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T4-005-telegram-user-sync
Estimated Hours: 3h

Done When

On first open, create user from Telegram data (name, photo, language). Link to existing account if email matches

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