Function qot_push_should_sample_delay 

pub fn qot_push_should_sample_delay(not_cal_delay: Option<i32>) -> bool

Decide whether a QOT push should contribute to delay statistics.

Ref: FutuOpenD/Src/APIServer/Business/Quote/QotRealTimeData.cpp:2202-2210 and the sibling push paths for BrokerQueue / OrderBook / US LV2 / Crypto LV2: C++ samples delay unless not_cal_delay is present and non-zero.