合约详情加入次日预测振幅，取最近5日波幅均值

ft-app/app/routers/contracts.py

@@ -79,6 +79,11 @@ def contract_detail(request: Request, contract: str, db: Session = Depends(get_d
 
     latest = bars[0] if bars else None
 
+    # Predict next trading day amplitude: mean of latest 5 diffs
+    next_amp = None
+    if len(bars) >= 5:
+        next_amp = round(sum(b.diff for b in bars[:5]) / 5)
+
     template = request.app.state.templates.get_template("contract.html")
     return HTMLResponse(
         template.render(
@@ -88,6 +93,7 @@ def contract_detail(request: Request, contract: str, db: Session = Depends(get_d
             contracts=active_contracts,
             rows=rows,
             latest=latest,
+            next_amp=next_amp,
             row_count=len(rows),
         )
     )