T4-028: TON keypair management — secure server wallet

Track: 4 — Telegram Mini App
Section: Phase C: TON Blockchain Integration (32h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T4-028-ton-keypair-management
Estimated Hours: 3h

Done When

Server TON wallet keypair in AWS Secrets Manager. Fund with minimal TON for gas. Monitor balance

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