feat: 修改委托后展示最新风险，四所持仓卡增加张数

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

tests/test_order_monitor_display_lib.py

@@ -1,5 +1,7 @@
 from lib.trade.order_monitor_display_lib import (
     apply_order_price_display_fields,
+    calc_latest_risk_amount,
+    calc_risk_fraction,
     is_sl_breakeven_secured,
     monitor_open_stop_loss,
     order_monitor_tpsl_needs_sync,
@@ -95,8 +97,27 @@ def test_apply_order_price_display_fields_live_sl():
         exchange_tpsl={"sl": {"trigger_price": 1661}, "tp": {"trigger_price": 1647.65}},
         format_price_fn=lambda _s, v: f"{v:.2f}",
         symbol="ETH/USDT:USDT",
+        margin_capital=100,
+        leverage=10,
+        exchange_notional=1000,
     )
     assert payload["stop_loss"] == 1661
     assert payload["stop_loss_display"] == "1661.00"
     assert payload["sl_breakeven_secured"] is True
     assert payload["rr_ratio"] is not None
+    assert payload["latest_risk_amount"] is not None
+    assert payload["latest_risk_amount"] >= 0
+
+
+def test_calc_latest_risk_amount_long():
+    rf = calc_risk_fraction("long", 100, 95)
+    assert rf is not None and abs(rf - 0.05) < 1e-9
+    risk = calc_latest_risk_amount(
+        "long", 100, 95, exchange_notional=1000, funds_decimals=2
+    )
+    assert risk == 50.0
+
+
+def test_calc_latest_risk_amount_profit_side_stop():
+    risk = calc_latest_risk_amount("long", 100, 101, exchange_notional=1000)
+    assert risk == 0.0