pub type SecuritySubscribeInput = (u64, Option<NonZeroU32>, Vec<(i32, SubBitOptions)>);Expand description
v1.4.110 Phase 2 Slice 4: per-security 输入 — (stock_id, broker_id, sub_types_with_opts)
3-tuple. broker_id = None 走 no-broker 路径 (普通股, Phase 2 默认),
Some(NonZeroU32) 走 broker-aware 路径 (crypto multi-broker).
抽出 type alias 防 clippy type_complexity warn.