User wallet addresses

GET /v1/user/wallet-addresses

Verbatim pass-through of /auth/me's wallets object, filtered to string-valued entries. Returns a flat record keyed by <purpose>-<chain> (e.g. spot-evm, spot-solana, abstraction-evm, earn-evm, perpetual-evm). The Portfolio Spot Value card surfaces spot-evm + spot-solana as click-to-copy chips; other keys are forwarded for future surfaces. 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, even on upstream failure (the UI polls this every 5 minutes and usePolling would otherwise preserve the last successful payload across an error, leaking a logged-out user's previous-session addresses).