Show OKX option Delta on hedge plan strike picker.

Surface ticker delta (gamma in tooltip) in the chain table and selected premium line for easier ITM selection.

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

lib/hedge_plan/templates/hedge_plan_panel.html

@@ -102,6 +102,7 @@
               <tr>
                 <th>行权价</th>
                 <th>类型</th>
+                <th title="交易所 Delta:标的变动时期权价敏感度;实值 |Δ| 通常更大(Call为正/Put为负)">Delta</th>
                 <th>合约</th>
                 <th>卖一/张</th>
                 <th title="币本位:1÷卖一">杠杆</th>
@@ -110,7 +111,7 @@
               </tr>
             </thead>
             <tbody id="hp-strike-tbody">
-              <tr><td colspan="7" class="muted">请刷新期权链</td></tr>
+              <tr><td colspan="8" class="muted">请刷新期权链</td></tr>
             </tbody>
           </table>
         </div>
@@ -508,4 +509,4 @@
     </div>
   </div>
 </div>
-<script src="/static/hedge_plan.js?v=68"></script>
+<script src="/static/hedge_plan.js?v=69"></script>