补充可配置过户费并纳入成交成本

crates/fidc-core/src/cost.rs

@@ -9,11 +9,12 @@ use crate::risk_control::TradingConstraintConfig;
 pub struct TradingCost {
     pub commission: f64,
     pub stamp_tax: f64,
+    pub transfer_fee: f64,
 }
 
 impl TradingCost {
     pub fn total(self) -> f64 {
-        self.commission + self.stamp_tax
+        self.commission + self.stamp_tax + self.transfer_fee
     }
 }
 
@@ -39,6 +40,7 @@ pub struct ChinaAShareCostModel {
     pub stamp_tax_rate_after_change: f64,
     pub stamp_tax_change_date: NaiveDate,
     pub minimum_commission: f64,
+    pub transfer_fee_rate: f64,
 }
 
 impl Default for ChinaAShareCostModel {
@@ -55,6 +57,7 @@ impl ChinaAShareCostModel {
             stamp_tax_rate_after_change: config.stamp_tax_rate_after_change,
             stamp_tax_change_date: config.stamp_tax_change_date,
             minimum_commission: config.minimum_commission,
+            transfer_fee_rate: config.transfer_fee_rate,
         }
     }
 
@@ -80,6 +83,13 @@ impl ChinaAShareCostModel {
         gross_amount * self.stamp_tax_rate_for(date)
     }
 
+    pub fn transfer_fee_for(&self, gross_amount: f64) -> f64 {
+        if gross_amount <= 0.0 {
+            return 0.0;
+        }
+        gross_amount * self.transfer_fee_rate
+    }
+
     pub fn commission_for_order_fill(
         &self,
         gross_amount: f64,
@@ -124,15 +134,18 @@ impl CostModel for ChinaAShareCostModel {
             return TradingCost {
                 commission: 0.0,
                 stamp_tax: 0.0,
+                transfer_fee: 0.0,
             };
         }
 
         let commission = self.commission_for(gross_amount);
         let stamp_tax = self.stamp_tax_for(date, side, gross_amount);
+        let transfer_fee = self.transfer_fee_for(gross_amount);
 
         TradingCost {
             commission,
             stamp_tax,
+            transfer_fee,
         }
     }
 
@@ -148,15 +161,18 @@ impl CostModel for ChinaAShareCostModel {
             return TradingCost {
                 commission: 0.0,
                 stamp_tax: 0.0,
+                transfer_fee: 0.0,
             };
         }
 
         let commission = self.commission_for_order_fill(gross_amount, order_id, commission_state);
         let stamp_tax = self.stamp_tax_for(date, side, gross_amount);
+        let transfer_fee = self.transfer_fee_for(gross_amount);
 
         TradingCost {
             commission,
             stamp_tax,
+            transfer_fee,
         }
     }
 }
@@ -181,6 +197,7 @@ mod tests {
         let config = TradingConstraintConfig {
             commission_rate: 0.0003,
             minimum_commission: 5.0,
+            transfer_fee_rate: 0.00001,
             stamp_tax_rate_before_change: 0.002,
             stamp_tax_rate_after_change: 0.001,
             stamp_tax_change_date: NaiveDate::from_ymd_opt(2025, 1, 10).expect("valid date"),
@@ -188,6 +205,8 @@ mod tests {
         };
         let model = ChinaAShareCostModel::from_trading_constraints(config);
 
+        assert!((model.transfer_fee_for(10_000.0) - 0.1).abs() < 1e-12);
+
         assert!(
             (model.stamp_tax_for(
                 NaiveDate::from_ymd_opt(2025, 1, 9).expect("valid date"),