划转默认折叠，修复币本位到期平衡计算

币本位权利金为币报价，到期平衡按 OKX 结算公式 K/(1±p) 计算；链/持仓/跨式平衡带同步修正。

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

lib/exchange/okx_options_lib.py

@@ -816,6 +816,7 @@ def build_option_chain(
             family = f"{u}-USD_UM"
     uly = f"{u}-USD"
     idx = index_px if index_px is not None else fetch_index_price(ex, uly)
+    chain_margin = "usdc" if "_UM" in family.upper() else "coin"
     now_ms = time.time() * 1000
     max_ms = now_ms + max_dte_days * 86400 * 1000
     instruments_err = ""
@@ -884,6 +885,8 @@ def build_option_chain(
             strike=strike,
             ask_px=ask,
             mark_px=mark,
+            inst_id=inst_id,
+            margin_mode=chain_margin,
         )
         mny = option_moneyness(opt_type=opt_type, strike=strike, index_px=idx)
         exp_key = str(exp_ms)
@@ -1028,6 +1031,7 @@ def quote_option_contract(ex: ccxt.okx, inst_id: str) -> dict[str, Any]:
             strike=strike,
             ask_px=book_ask if can_open else None,
             mark_px=mark,
+            inst_id=inst_id,
         )
         return {
             "ok": True,
@@ -1815,6 +1819,8 @@ def format_position_row(
         strike=strike,
         avg_px=avg,
         be_px_api=_safe_float(pos.get("bePx")),
+        inst_id=inst_id,
+        margin_mode=row_mode,
     )
     close_be = close_breakeven_idx(
         opt_type=str(opt_type or ""),