T3-008: Store wallet public key in backend user profile

Track: 3 — Solana Phone / Web3
Section: Phase B: Wallet Integration via MWA (56h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T3-008-wallet-address-column
Estimated Hours: 3h

Done When

New wallet_address column on users table. PUT /profile accepts wallet_address. Validated as valid Solana public key

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