Options: default nearest expiry and env ask-liquidity chain filter.

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

lib/options/templates/options_panel.html

@@ -1,5 +1,6 @@
 <div class="options-page-wrap" style="grid-column:1/-1" id="options-root"
-     data-default-underly="{{ options_default_underly | default('ETH') }}">
+     data-default-underly="{{ options_default_underly | default('ETH') }}"
+     data-ask-liq-filter="{% if options_chain_ask_liq_filter is defined %}{{ '1' if options_chain_ask_liq_filter else '0' }}{% else %}1{% endif %}">
     {% 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 %}
@@ -7,7 +8,7 @@
     <div class="options-dual-grid">
         <div class="card options-order-card">
             <h2>期权下单 <a class="muted" href="/options/guide" target="_blank" rel="noopener" style="font-size:13px;font-weight:500;margin-left:8px">开平仓与监控说明</a></h2>
-            <p class="muted options-hint">报价单位为每 1 ETH/BTC;1 张 = 0.01.<strong>列表</strong>含卖一/买一;<strong>T 型</strong>仅卖一(买方开仓),中间为跨式双买测算.链上无卖一挂单时以标记价/内在价值估算并标 <strong>~</strong>(仅参考).<strong>开仓只认真实卖一价且卖一深度&gt;0</strong>;无深度时面板显示参考标记价并禁用买入.链展示近 <span id="opt-chain-dte">14</span> 日到期.<strong>T 型</strong>默认 ATM ±5 档,可展开全部.平仓仅买一限价,见说明.</p>
+            <p class="muted options-hint">报价单位为每 1 ETH/BTC;1 张 = 0.01.默认选中<strong>最近一期</strong>到期,可手动改.<strong>列表</strong>含卖一/买一;<strong>T 型</strong>仅卖一(买方开仓),中间为跨式双买测算.环境配置「链上仅显示有卖一」开启时,隐藏无真实卖一或深度不足 1 张的合约(估算价 <strong>~</strong> 亦不显示).<strong>开仓只认真实卖一价且卖一深度≥1</strong>.链展示近 <span id="opt-chain-dte">14</span> 日到期.<strong>T 型</strong>默认 ATM ±5 档,可展开全部.平仓仅买一限价,见说明.</p>
             <div class="form-row options-chain-toolbar">
                 <button type="button" class="btn-secondary opt-uly-btn active" data-uly="ETH">ETH</button>
                 <button type="button" class="btn-secondary opt-uly-btn" data-uly="BTC">BTC</button>
@@ -299,4 +300,4 @@
     </div>
 </div>
 <script src="/static/options_expiry_countdown.js?v=1"></script>
-<script src="/static/options_panel.js?v=45"></script>
+<script src="/static/options_panel.js?v=46"></script>