修复持仓监控页长时间空白：品种推荐改为异步加载。

页面先渲染三卡片，推荐表并行拉行情，持仓与推荐分别通过 API 加载。

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

install_trading.py

@@ -289,7 +289,6 @@ def install_trading(app, *, login_required, get_db, get_setting, set_setting, fe
             capital = _capital(conn)
             risk = get_risk_status(conn)
             ctp_acc = _ctp_account(mode) if ctp_st.get("connected") else {}
-            recommend_rows = list_product_recommendations(capital, _main_price)
             active_trend = conn.execute(
                 "SELECT * FROM trend_pullback_plans WHERE status='active' ORDER BY id DESC LIMIT 1"
             ).fetchone()
@@ -309,7 +308,6 @@ def install_trading(app, *, login_required, get_db, get_setting, set_setting, fe
                 risk_status=risk,
                 ctp_status=ctp_st,
                 ctp_account=ctp_acc,
-                recommend_rows=recommend_rows,
                 active_trend=dict(active_trend) if active_trend else None,
                 monitor_count=monitor_count,
                 roll_count=roll_count,