T4-026: TON transaction verification

Track: 4 — Telegram Mini App
Section: Phase C: TON Blockchain Integration (32h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T4-026-ton-tx-verification
Estimated Hours: 3h

Done When

Verify TON transfers on-chain. Check: correct amount, correct recipient, finalized. Update reward status

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