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

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

backend/app/sim/matcher.py

@@ -1055,9 +1055,7 @@ class Matcher:
             if opt_mark is not None:
                 option_upl = float(opt_mark) * opt_qty - initial_premium
 
-        est_close_fees = est_perp_close_fee + est_opt_close_fee
-        # 净盈利：永续浮盈 + 期权浮盈 − 预估平仓手续费
-        net_pnl = perp_upl + option_upl - est_close_fees
+        book_close_fees = est_perp_close_fee + est_opt_close_fee
 
         entry_idx = float(pos["entry_index_px"] or 0)
         move = abs(float(index_px) - entry_idx) if index_px is not None and entry_idx else 0.0
@@ -1081,6 +1079,14 @@ class Matcher:
         strike = float(g["strike"]) if g and g["strike"] is not None else None
         expiry_ymd = str(g["expiry_ymd"]) if g and g["expiry_ymd"] else None
         open_at_ms = int(g["open_at_ms"]) if g and g["open_at_ms"] else None
+        open_fees = abs(float(g["fees"] or 0)) if g else 0.0
+        # 净盈利：浮盈 − 入场手续费×2（离场费按入场估算）；无入场费时退回盘口估平仓费
+        if open_fees > 1e-12:
+            est_close_fees = open_fees
+            net_pnl = perp_upl + option_upl - open_fees * 2.0
+        else:
+            est_close_fees = book_close_fees
+            net_pnl = perp_upl + option_upl - est_close_fees
         expiry_ms = None
         if expiry_ymd and len(expiry_ymd) == 6:
             try:
@@ -1120,6 +1126,7 @@ class Matcher:
             "expiry_ms": expiry_ms,
             "perp_upl": perp_upl,
             "option_upl": option_upl,
+            "fees_paid": open_fees,
             "est_close_fees": est_close_fees,
             "net_pnl": net_pnl,
             "index_px": index_px,