初始化合约，设置 owner
fn initialize(env: soroban_sdk::Env, owner: soroban_sdk::Address)充值: owner 向合约转入 token
fn deposit(env: soroban_sdk::Env, token: soroban_sdk::Address, amount: i128)提现: owner 从合约取出 token
fn withdraw(env: soroban_sdk::Env, token: soroban_sdk::Address, amount: i128)提现全部余额
fn withdraw_all(env: soroban_sdk::Env, token: soroban_sdk::Address)升级合约 WASM (仅 owner)
fn upgrade(env: soroban_sdk::Env, new_wasm_hash: soroban_sdk::BytesN<32>)添加授权 caller (可以调用 execute_arb/execute_amm_leg)
fn add_caller(env: soroban_sdk::Env, caller: soroban_sdk::Address)移除授权 caller
fn remove_caller(env: soroban_sdk::Env, caller: soroban_sdk::Address)查询合约余额
fn balance(env: soroban_sdk::Env, token: soroban_sdk::Address) -> i128查询 owner
fn owner(env: soroban_sdk::Env) -> soroban_sdk::Address查询是否是授权 caller
fn is_authorized(env: soroban_sdk::Env, caller: soroban_sdk::Address) -> boolfn execute_arb(
env: soroban_sdk::Env,
caller: soroban_sdk::Address,
token_in: soroban_sdk::Address,
amount_in: i128,
steps: soroban_sdk::Vec,
min_profit: i128,
) fn execute_amm_leg(
env: soroban_sdk::Env,
caller: soroban_sdk::Address,
token_in: soroban_sdk::Address,
amount_in: i128,
steps: soroban_sdk::Vec,
token_out_final: soroban_sdk::Address,
min_amount_out: i128,
pull_from_caller: bool,
push_to_caller: bool,
)