T3-043: Solana keypair management — secure key storage

Track: 3 — Solana Phone / Web3
Section: Infrastructure & Testing (20h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T3-043-keypair-management
Estimated Hours: 3h

Done When

Mint authority keypair stored in AWS Secrets Manager. Never exposed in code. Rotation procedure documented

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