perf: cache symbol board classification

crates/fidc-core/src/risk_control.rs

@@ -4,7 +4,7 @@ use chrono::NaiveDate;
 use serde::{Deserialize, Serialize};
 
 use crate::OrderSide;
-use crate::data::{CandidateEligibility, DailyMarketSnapshot, PriceField};
+use crate::data::{CandidateEligibility, DailyMarketSnapshot, PriceField, symbol_is_bjse};
 use crate::instrument::Instrument;
 use crate::portfolio::Position;
 
@@ -602,11 +602,6 @@ fn symbol_is_kcb(symbol: &str) -> bool {
     (normalized.starts_with("688") || normalized.starts_with("689")) && normalized.ends_with(".SH")
 }
 
-fn symbol_is_bjse(symbol: &str) -> bool {
-    let normalized = symbol.trim().to_ascii_uppercase();
-    normalized.ends_with(".BJ") || normalized.ends_with(".BSE") || normalized.ends_with(".BE")
-}
-
 fn candidate_active_status_rejection(
     candidate: &CandidateEligibility,
     config: &FidcRiskControlConfig,