期权链列名「距平衡」改为「平衡价差」

列表表头与下单面板标签统一为平衡价差。

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

lib/options/templates/options_panel.html

@@ -75,7 +75,7 @@
                             <th title="USDC:指数÷卖一;币本位:1÷卖一(卖一为币报价)">杠杆</th>
                             <th>买一/张</th>
                             <th>到期平衡</th>
-                            <th>距平衡</th>
+                            <th>平衡价差</th>
                             <th>操作</th>
                         </tr>
                         <tr id="opt-strike-head-t" class="hidden" hidden>
@@ -118,7 +118,7 @@
                                 <div><span class="k">预估权利金</span><span id="opt-order-premium" class="v">—</span></div>
                                 <div><span class="k">合约杠杆</span><span id="opt-order-leverage" class="v" title="名义价值÷权利金,测算用">—</span></div>
                                 <div><span class="k">到期平衡</span><span id="opt-order-expiry-be" class="v">—</span></div>
-                                <div><span class="k">距平衡</span><span id="opt-order-dist-be" class="v">—</span></div>
+                                <div><span class="k">平衡价差</span><span id="opt-order-dist-be" class="v">—</span></div>
                             </div>
                             <div class="options-estimate-row">
                                 <div class="opt-est-main">