修正AiQuant兼容佣金默认值

crates/fidc-core/src/cost.rs

@@ -55,6 +55,7 @@ impl Default for ChinaAShareCostModel {
 impl ChinaAShareCostModel {
     pub fn aiquant_rqalpha_default() -> Self {
         Self {
+            commission_rate: 0.00025,
             stamp_tax_rate_before_change: 0.0005,
             stamp_tax_rate_after_change: 0.0005,
             ..Self::default()

crates/fidc-core/tests/core_rules.rs

@@ -66,6 +66,22 @@ fn china_cost_model_applies_minimum_commission_and_stamp_tax() {
     assert!((sell.stamp_tax - 100.0).abs() < 1e-9);
 }
 
+#[test]
+fn aiquant_rqalpha_cost_model_matches_alv_run_options() {
+    let model = ChinaAShareCostModel::aiquant_rqalpha_default();
+
+    let buy = model.calculate(d(2026, 5, 19), OrderSide::Buy, 49_978.84);
+    assert!((buy.commission - 12.49471).abs() < 1e-9);
+    assert_eq!(buy.stamp_tax, 0.0);
+
+    let sell = model.calculate(d(2026, 5, 19), OrderSide::Sell, 100_724.72);
+    assert!((sell.commission - 25.18118).abs() < 1e-9);
+    assert!((sell.stamp_tax - 50.36236).abs() < 1e-9);
+
+    let small_buy = model.calculate(d(2026, 5, 19), OrderSide::Buy, 1_000.0);
+    assert!((small_buy.commission - 5.0).abs() < 1e-9);
+}
+
 #[test]
 fn china_cost_model_switches_stamp_tax_rate_after_2023_08_28() {
     let model = ChinaAShareCostModel::default();