fix期权下单默认按可用余额打满；持仓上限/缓冲/门控秒数默认值调整。

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

lib/options/options_margin_mode_lib.py

@@ -82,9 +82,9 @@ def compute_coin_budget_usdt(
     """
     bal = max(0.0, float(trading_usdt or 0))
     use_compound = _env_bool("OKX_OPTIONS_COIN_COMPOUND", True) if compound is None else bool(compound)
-    buf = float(buffer) if buffer is not None else _env_float("OKX_OPTIONS_BUDGET_BUFFER", 0.95)
+    buf = float(buffer) if buffer is not None else _env_float("OKX_OPTIONS_BUDGET_BUFFER", 1.0)
     if buf <= 0:
-        buf = 0.95
+        buf = 1.0
     fixed = (
         float(fixed_budget_usdt)
         if fixed_budget_usdt is not None
@@ -129,18 +129,18 @@ def compute_coin_budget_usdt(
 def normalize_coin_spot_buy_buffer(raw: Any = None) -> float:
     """
     现货买入相对权利金的倍数缓冲.
-    env OKX_OPTIONS_COIN_SPOT_BUY_BUFFER 默认 1.10(=多买 10%).
-    也可写 0.10 表示 +10%.
+    env OKX_OPTIONS_COIN_SPOT_BUY_BUFFER 默认 1.05(=多买 5%).
+    也可写 0.05 表示 +5%.
     """
     if raw is None:
-        v = _env_float("OKX_OPTIONS_COIN_SPOT_BUY_BUFFER", 1.10)
+        v = _env_float("OKX_OPTIONS_COIN_SPOT_BUY_BUFFER", 1.05)
     else:
         try:
             v = float(raw)
         except (TypeError, ValueError):
-            v = 1.10
+            v = 1.05
     if v <= 0:
-        return 1.10
+        return 1.05
     if v < 1.0:
         return 1.0 + v
     return v