T4-025: TON reward distribution — send TON to challenge winners

Track: 4 — Telegram Mini App
Section: Phase C: TON Blockchain Integration (32h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T4-025-ton-reward-distribution
Estimated Hours: 6h

Done When

Backend sends TON to winner wallets via TON SDK. Transaction built, signed by server keypair, broadcast. Confirmation tracked

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