Add OKX three-way trade mode for options vs hedge.

Env OKX_TRADE_MODE selects standalone options, perp hedge, or OO hedge; hide the other module UI and use group or position limits per mode.

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

lib/options/templates/options_panel.html

@@ -6,10 +6,13 @@
     {% if not options_enabled %}
     <div class="flash" style="margin-bottom:12px">期权 API 未启用:请在 <code>crypto_monitor_okx/.env</code> 设置 <code>OKX_OPTIONS_ENABLED=true</code> 及主账户 <code>OKX_OPTIONS_API_*</code>,然后 <code>pm2 restart crypto_okx --update-env</code>.</div>
     {% endif %}
+    {% if options_enabled and options_open_allowed is defined and not options_open_allowed %}
+    <div class="flash" style="margin-bottom:12px">当前交易模式为对冲(永期/期期),不可单独开期权;持仓可在此查看/平仓.切换请到 env「交易模式」.</div>
+    {% endif %}
 
     <div class="options-dual-grid">
-        <div class="card options-order-card">
-            <h2>期权下单</h2>
+        <div class="card options-order-card"{% if options_open_allowed is defined and not options_open_allowed %} style="opacity:.72"{% endif %}>
+            <h2>期权下单{% if options_open_allowed is defined and not options_open_allowed %} <small class="muted">(对冲模式已禁用开仓)</small>{% endif %}</h2>
             <details class="opt-close-rule opt-open-rule">
                 <summary>开仓规则说明</summary>
                 <div class="opt-close-rule-body">