feat(hub): show exchange mark price on monitor positions

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

tests/test_hub_agent_mark_price.py

@@ -0,0 +1,32 @@
+"""子代理持仓：四所标记价字段统一解析。"""
+from __future__ import annotations
+
+import sys
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(ROOT / "manual_trading_hub"))
+
+from agent import _position_mark_price  # noqa: E402
+
+
+class TestHubAgentMarkPrice(unittest.TestCase):
+    def test_binance_mark_price(self):
+        px = _position_mark_price({"markPrice": 65880.1, "info": {}})
+        self.assertAlmostEqual(px, 65880.1)
+
+    def test_okx_mark_px(self):
+        px = _position_mark_price({"info": {"markPx": "72.85"}})
+        self.assertAlmostEqual(px, 72.85)
+
+    def test_gate_info_mark(self):
+        px = _position_mark_price({"info": {"mark_price": "0.2241"}})
+        self.assertAlmostEqual(px, 0.2241)
+
+    def test_missing_returns_none(self):
+        self.assertIsNone(_position_mark_price({"info": {}}))
+
+
+if __name__ == "__main__":
+    unittest.main()