本地监控止盈止损、盘前自动连CTP，并完善保证金与推荐手数。

- 止盈止损改为程序本地监控，触发后市价平仓（含跳空）
- 交易前30分钟后台自动连接 CTP
- 保证金占用上限默认30%，可在系统设置修改
- K线标准蜡烛图红跌绿涨，费率表全宽固定表头
- 品种推荐按保证金比例×总资金计算推荐手数

Co-authored-by: Cursor <cursoragent@cursor.com>

app.py

@@ -369,6 +369,8 @@ def init_db():
         set_setting("position_sizing_mode", "risk")
     if not get_setting("risk_percent"):
         set_setting("risk_percent", "1")
+    if not get_setting("max_margin_pct"):
+        set_setting("max_margin_pct", "30")
     if not get_setting("fee_source_mode"):
         set_setting("fee_source_mode", "ctp")
     set_setting("fee_source_mode", "ctp")
@@ -1620,6 +1622,12 @@ def settings():
             except ValueError:
                 flash("风险比例无效")
                 return redirect(url_for("settings"))
+            try:
+                mp = float(request.form.get("max_margin_pct", "30") or 30)
+                set_setting("max_margin_pct", str(max(1.0, min(100.0, mp))))
+            except ValueError:
+                flash("保证金比例无效")
+                return redirect(url_for("settings"))
             flash("交易模式已保存")
         elif action == "nav":
             items = {k: request.form.get(f"nav_{k}") == "on" for k in NAV_TOGGLES}
@@ -1659,6 +1667,7 @@ def settings():
         trading_mode=get_setting("trading_mode", "simulation"),
         position_sizing_mode=get_setting("position_sizing_mode", "risk"),
         risk_percent=get_setting("risk_percent", "1"),
+        max_margin_pct=get_setting("max_margin_pct", "30"),
         nav_items=get_nav_items(get_setting),
         nav_toggles=NAV_TOGGLES,
     )