对冲管理新增品种筛选，合约下拉去掉品种前缀

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

ft-app/app/routers/positions.py

@@ -3,7 +3,7 @@ from fastapi import APIRouter, Depends, Form, Request
 from fastapi.responses import HTMLResponse, RedirectResponse
 from sqlalchemy.orm import Session
 from app.database import get_db
-from app.models import Round, Position, Contract
+from app.models import Round, Position, Contract, Product
 
 router = APIRouter(prefix="/positions", tags=["positions"])
 
@@ -18,6 +18,16 @@ def get_active_contracts(db: Session) -> list[str]:
     return [c[0] for c in contracts]
 
 
+def get_product_contracts(db: Session) -> dict:
+    result: dict[str, list[str]] = {}
+    products = db.query(Product).order_by(Product.code).all()
+    for p in products:
+        codes = [c.code for c in p.contracts if c.is_active]
+        if codes:
+            result[p.code] = codes
+    return result
+
+
 @router.get("/", response_class=HTMLResponse)
 def positions_page(request: Request, db: Session = Depends(get_db)):
     active_rounds = (
@@ -33,6 +43,7 @@ def positions_page(request: Request, db: Session = Depends(get_db)):
             request=request,
             active_nav="positions",
             contracts=get_active_contracts(db),
+            product_contracts=get_product_contracts(db),
             active_rounds=active_rounds,
         )
     )