6_合约文档 L1/L2 Bridge Inbox Outbox Core Protocol Challenge Node Rollup RollupCore Token Bridge GatewayRouter L1GatewayRouter L1ERC20Gateway L2GatewayRouter L2ERC20Gateway StandardArbERC20 aeERC20 ICustomToken Arb-Precompiled Contracts ArbSys ArbRetryableTx ArbAddressTable NodeInterface ←5_ArbOS信息与log格式