品种增加每点价值字段，PNL计算支持不同品种差异化配置

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ft-app/app/routers/trades.py

@@ -74,7 +74,12 @@ def open_trade(
 ):
     code = contract_code.upper()
     contract = db.query(Contract).filter(Contract.code == code).first()
-    product_code = contract.product.code if contract else code[:2]
+    if contract:
+        product = contract.product
+    else:
+        product = db.query(Product).filter(Product.code == code[:2]).first()
+    product_code = product.code if product else code[:2]
+    point_value = product.point_value if product else 20
 
     t = Trade(
         product_code=product_code,
@@ -83,6 +88,7 @@ def open_trade(
         open_date=date.fromisoformat(open_date),
         open_price=open_price,
         open_fee=open_fee,
+        point_value=point_value,
         status="open",
     )
     db.add(t)
@@ -127,7 +133,12 @@ def edit_trade(
     if t:
         code = contract_code.upper()
         contract = db.query(Contract).filter(Contract.code == code).first()
-        t.product_code = contract.product.code if contract else code[:2]
+        if contract:
+            product = contract.product
+        else:
+            product = db.query(Product).filter(Product.code == code[:2]).first()
+        t.product_code = product.code if product else code[:2]
+        t.point_value = product.point_value if product else 20
         t.contract_code = code
         t.direction = direction
         t.open_date = date.fromisoformat(open_date)