Count exit fees in live/SIM net PnL as entry fee x2.

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

backend/tests/test_live_pnl.py

@@ -45,7 +45,7 @@ class _FakeClient:
         return -1.5
 
 
-def test_enrich_live_unrealized_no_est_close_fee() -> None:
+def test_enrich_live_unrealized_entry_fee_times_two() -> None:
     base = {
         "has_position": True,
         "group_id": "G1",
@@ -73,7 +73,8 @@ def test_enrich_live_unrealized_no_est_close_fee() -> None:
     assert out["option_upl"] == 5.0
     assert out["fees_paid"] == 0.5
     assert out["funding_usdt"] == -1.5
-    assert out["est_close_fees"] == 0.0
-    # 8 + 5 - 0.5 + (-1.5) = 11
-    assert abs(out["net_pnl"] - 11.0) < 1e-9
+    # 离场费按入场估算
+    assert out["est_close_fees"] == 0.5
+    # 8 + 5 - 0.5*2 + (-1.5) = 10.5
+    assert abs(out["net_pnl"] - 10.5) < 1e-9
     assert out["pnl_source"] == "live_exchange"