fix模拟盘盈亏：按权利金净额×平仓指数，不再把买币预算差额当盈利。

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

lib/options/options_positions_lib.py

@@ -142,15 +142,25 @@ def display_pnl_usdt_from_option_row(row: dict[str, Any]) -> float | None:
 def premium_paid_usdt_from_option_row(row: dict[str, Any]) -> float | None:
     """开仓权利金折 USDT.
 
-    优先用开仓时兑换/预算占用的 budget_usdt(不随币价浮动);
-    否则 USDC 原样;币本位无预算记录时才回退 × 当前指数.
+    用权利金币数量 × 开仓/标记指数;绝不用 budget_usdt(那是买币缓冲预算,不是权利金).
     """
-    entry = _safe_float(row.get("premium_entry_usdt") or row.get("budget_usdt"))
+    entry = _safe_float(row.get("premium_entry_usdt"))
     if entry is not None:
         return round(float(entry), 4)
     paid = _safe_float(row.get("premium_paid"))
     if paid is None:
         return None
+    ccy = str(row.get("premium_ccy") or "USDC").strip().upper() or "USDC"
+    if ccy in ("ETH", "BTC"):
+        idx = _safe_float(
+            row.get("open_index_px")
+            or row.get("idx_px")
+            or row.get("idxPx")
+            or row.get("index_px")
+        )
+        if idx is None or idx <= 0:
+            return None
+        return round(float(paid) * float(idx), 4)
     return _coin_amount_to_usdt(paid, row)
 
 
@@ -254,7 +264,10 @@ def build_display_option_positions(
         )
         if budget_usdt is not None:
             row["budget_usdt"] = round(float(budget_usdt), 4)
-            row["premium_entry_usdt"] = round(float(budget_usdt), 4)
+        # 权利金入口 U:币数量×指数,不用买币预算
+        prem_u = premium_paid_usdt_from_option_row(row)
+        if prem_u is not None:
+            row["premium_entry_usdt"] = round(float(prem_u), 4)
         if include_close_preview:
             attach_close_preview(cfg, ex, row, premium_paid=_safe_float(row.get("premium_paid")))
         rows.append(row)