Count instance win rate by positive PnL and show external closes as manual close.

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

tests/test_trade_result_lib.py

@@ -1,4 +1,4 @@
-from trade_result_lib import normalize_result_with_pnl
+from trade_result_lib import normalize_result_with_pnl, normalize_display_result, is_winning_pnl
 
 
 def test_stop_loss_with_profit_becomes_trailing_tp():
@@ -15,3 +15,16 @@ def test_stop_loss_with_loss_unchanged():
 
 def test_take_profit_unchanged():
     assert normalize_result_with_pnl("止盈", 5) == "止盈"
+
+
+def test_external_close_becomes_manual_close():
+    assert normalize_display_result("外部平仓") == "手动平仓"
+    assert normalize_result_with_pnl("外部平仓", 2.5) == "手动平仓"
+    assert normalize_result_with_pnl("外部平仓（自动同步）", -1) == "手动平仓"
+
+
+def test_winning_pnl_positive_only():
+    assert is_winning_pnl(2.96) is True
+    assert is_winning_pnl(0) is False
+    assert is_winning_pnl(-1.05) is False
+    assert is_winning_pnl(None) is False