//! Option data — comprehensive option market data from multiple sources.
//!
//! ## Data sources
//!
//! - **Eastmoney** — Current-day options, minute data, analysis (premium/value/risk), billboard
//! - **Sina Finance** — CFFEX index options (SZ50, HS300, ZZ1000), SSE ETF options
//! - **SSE/SZSE** — Current day contracts, daily statistics, risk indicators, finance board
//! - **Commodity exchanges** — DCE, CZCE, SHFE, GFEX daily option data
//! - **Other** — Commission info (9qihuo), margin data (iweiai), CTP contract info (openctp)