T4-004: TWA authentication — validate initData from Telegram

Track: 4 — Telegram Mini App
Section: Phase A: Bot & Mini App Foundation (24h)
Status: [ ] Todo
Repo: backend-api + telegram-mini-app
Branch: feature/T4-004-twa-auth-initdata
Estimated Hours: 4h

Done When

Backend validates Telegram initData hash. Creates/links user account. Returns JWT for API calls

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