fix(okx): show negative unrealized PnL on strategy page

Parse signed upl/unrealizedPnl from CCXT positions and fall back to calc_pnl when exchange metrics are missing.

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

tests/test_okx_position_metrics.py

@@ -0,0 +1,38 @@
+"""OKX 持仓指标解析：未实现盈亏须支持负数。"""
+from __future__ import annotations
+
+import unittest
+
+
+class TestOkxPositionMetrics(unittest.TestCase):
+    def test_parse_unrealized_pnl_negative(self):
+        from crypto_monitor_okx.app import parse_ccxt_position_metrics
+
+        pos = {
+            "side": "long",
+            "contracts": 10,
+            "markPrice": 0.43,
+            "unrealizedPnl": -1.25,
+            "info": {"upl": "-1.25", "markPx": "0.43"},
+        }
+        out = parse_ccxt_position_metrics(pos, order_leverage=5)
+        self.assertIsNotNone(out)
+        self.assertAlmostEqual(out["unrealized_pnl"], -1.25)
+        self.assertAlmostEqual(out["mark_price"], 0.43)
+
+    def test_parse_unrealized_pnl_zero(self):
+        from crypto_monitor_okx.app import parse_ccxt_position_metrics
+
+        pos = {
+            "side": "long",
+            "contracts": 1,
+            "unrealizedPnl": 0,
+            "info": {"upl": "0"},
+        }
+        out = parse_ccxt_position_metrics(pos)
+        self.assertIsNotNone(out)
+        self.assertEqual(out["unrealized_pnl"], 0.0)
+
+
+if __name__ == "__main__":
+    unittest.main()