User wallet addresses

GET /v1/user/wallet-addresses

Compatibility address-only projection of /auth/me's wallets object. Returns a flat record keyed by <purpose>-<chain> (e.g. spot-evm, spot-solana, abstraction-evm, earn-evm, perpetual-evm). New clients should read /v1/user/profile.walletAddresses so identity and wallet addresses come from one account snapshot. The nested whitelist object on the upstream payload is dropped (only addresses come through). New purposes / chains may extend the key set; clients must tolerate unknown keys. Always returns HTTP 200 and returns {} on upstream failure so compatibility clients can clear previous-session addresses.