T4-029: TON testnet testing — full reward flow

Track: 4 — Telegram Mini App
Section: Phase C: TON Blockchain Integration (32h)
Status: [ ] Todo
Repo: backend-api + telegram-mini-app
Branch: feature/T4-029-ton-testnet-testing
Estimated Hours: 4h

Done When

Test on TON testnet: create challenge -> complete -> claim reward -> verify on-chain. Test TON from faucet

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