T3-011: Backend signature verification endpoint

Track: 3 — Solana Phone / Web3
Section: Phase B: Wallet Integration via MWA (56h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T3-011-wallet-verify-endpoint
Estimated Hours: 4h

Done When

POST /auth/wallet-verify accepts {publicKey, signature, message}. Verifies ed25519 signature. Returns JWT token if valid

Notes

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