private/register_withdraw_address

Returns the Ethereum withdraw address that forwards a withdrawal of a forwarded token to a recipient on its home chain, and records it so the forwarder watches it. Takes the wallet, the destination chain id (a key of the route file's withdraw_forwarding section; Solana is 101, devnet 103) and the recipient. On an EVM chain the recipient must be the account wallet; on Solana it must be a base58 wallet address, which is screened. Repeated calls return the same address; new registrations are rate limited per rolling window. Withdraw to the returned address with private/withdraw. Session keys without unbounded Admin scope must first add it with private/update_whitelisted_recipients.