feat: expand header stats with total funds and profit-loss ratio

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

tests/test_instance_header_stats_lib.py

@@ -0,0 +1,33 @@
+"""instance_embed_context_lib 顶栏统计。"""
+from __future__ import annotations
+
+import unittest
+
+from lib.instance.instance_embed_context_lib import (
+    profit_loss_ratio_from_averages,
+    profit_loss_ratio_from_trades,
+    total_funds_usdt,
+)
+
+
+class TestHeaderStatsLib(unittest.TestCase):
+    def test_profit_loss_ratio_from_averages(self):
+        self.assertEqual(profit_loss_ratio_from_averages(9.0, -3.0), 3.0)
+        self.assertIsNone(profit_loss_ratio_from_averages(9.0, 0))
+
+    def test_profit_loss_ratio_from_trades(self):
+        trades = [
+            {"effective_pnl_amount": 10},
+            {"effective_pnl_amount": 8},
+            {"effective_pnl_amount": -4},
+            {"effective_pnl_amount": -2},
+        ]
+        self.assertEqual(profit_loss_ratio_from_trades(trades), 3.0)
+
+    def test_total_funds_usdt(self):
+        self.assertEqual(total_funds_usdt(100.5, 59.27), 159.77)
+        self.assertIsNone(total_funds_usdt(None, 10))
+
+
+if __name__ == "__main__":
+    unittest.main()