feat: 持仓快照盈亏比与交易所止损已保本标识

盈亏比固定用开仓 initial_stop_loss 计算，人工改委托后不变化；轮询交易所止损触发价相对成交价判定已保本，四所实例与中控统一显示绿色标识。

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

tests/test_order_monitor_display_lib.py

@@ -0,0 +1,50 @@
+from order_monitor_display_lib import (
+    is_sl_breakeven_secured,
+    sl_breakeven_from_exchange_tpsl,
+    snapshot_rr,
+    snapshot_stop_loss,
+)
+
+
+def _calc_rr(direction, entry, sl, tp):
+    if direction == "long":
+        risk = entry - sl
+        reward = tp - entry
+    else:
+        risk = sl - entry
+        reward = entry - tp
+    if risk <= 0 or reward <= 0:
+        return None
+    return round(reward / risk, 4)
+
+
+def test_snapshot_stop_loss_prefers_initial():
+    assert snapshot_stop_loss(2.45, 2.6) == 2.45
+    assert snapshot_stop_loss(None, 2.6) == 2.6
+
+
+def test_snapshot_rr_ignores_current_stop_after_manual_move():
+    rr = snapshot_rr(_calc_rr, "long", 2.726, 2.45, 2.65, 3.3)
+    assert rr is not None
+    assert rr > 2.0
+
+
+def test_breakeven_long():
+    assert is_sl_breakeven_secured("long", 2.726, 2.726) is True
+    assert is_sl_breakeven_secured("long", 2.726, 2.75) is True
+    assert is_sl_breakeven_secured("long", 2.726, 2.45) is False
+
+
+def test_breakeven_short():
+    assert is_sl_breakeven_secured("short", 72.73, 72.73) is True
+    assert is_sl_breakeven_secured("short", 72.73, 72.0) is True
+    assert is_sl_breakeven_secured("short", 72.73, 74.0) is False
+
+
+def test_sl_breakeven_from_exchange_tpsl():
+    ok = sl_breakeven_from_exchange_tpsl(
+        "long",
+        2.726,
+        {"sl": {"trigger_price": 2.735}, "tp": {"trigger_price": 3.3}},
+    )
+    assert ok is True