Revert "perf: cache symbol board classification"

This reverts commit eb8b14602a.

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, symbol_is_bjse};
+use crate::data::{CandidateEligibility, DailyMarketSnapshot, PriceField};
 use crate::instrument::Instrument;
 use crate::portfolio::Position;
 
@@ -602,6 +602,11 @@ 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,