Function basic_qot_wait_key 

pub fn basic_qot_wait_key(cache_key: &str) -> String

v1.4.110 codex Phase 3 Slice 6c: cold-cache wait key for BasicQot.

输入 cache_key (legacy "market_code" 或 broker-aware "market_code@b1007"), 输出 "<cache_key>:basic" 形式 wait key. 与 OrderBook wait key 分桶, 避免互相错唤醒.