Polish option close depth display.

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

lib/options/templates/options_panel.html

@@ -90,6 +90,18 @@
                     <div id="opt-pos-live" class="panel-scroll pos-list options-pos-live-pane">
                         <div class="pos-empty" id="opt-pos-empty">暂无持仓</div>
                         <div id="opt-pos-cards"></div>
+                        <details class="opt-close-rule">
+                            <summary>多档平仓规则说明</summary>
+                            <div class="opt-close-rule-body">
+                                <p>系统平仓前会重新读取最新买盘,不使用页面缓存。</p>
+                                <ul>
+                                    <li>买一数量足够覆盖持仓时,只按买一价提交一笔限价卖单。</li>
+                                    <li>买一不够时,先卖买一可覆盖数量;成交后刷新持仓和盘口,再继续用新的最优买盘拆分。</li>
+                                    <li>最多尝试 5 次,全程使用限价卖出,并带 <code>reduceOnly</code>,不会主动市价平仓。</li>
+                                    <li>盘口不足或订单未成交时会停止后续拆单,并提示剩余张数。</li>
+                                </ul>
+                            </div>
+                        </details>
                     </div>
                 </div>
                 <div class="options-pos-pane" data-opt-pos-pane="stats" role="tabpanel" aria-labelledby="opt-pos-tab-stats" hidden>
@@ -200,4 +212,4 @@
     </div>
 </div>
 <script src="/static/options_expiry_countdown.js?v=1"></script>
-<script src="/static/options_panel.js?v=21"></script>
+<script src="/static/options_panel.js?v=22"></script>