期权交易"权利金"改为"开仓价"；新增期权双买交易功能，支持跨式策略开平仓及组合盈亏分析

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ft-app/app/templates/options.html

@@ -69,7 +69,7 @@
         <input type="number" step="any" name="strike_price" required placeholder="1300" style="font-size:0.9rem;">
       </div>
       <div class="form-group" style="margin-bottom:0;flex:0 0 auto;min-width:80px;">
-        <label>权利金</label>
+        <label>开仓价</label>
         <input type="number" step="any" name="open_price" required placeholder="25" style="font-size:0.9rem;">
       </div>
       <div class="form-group" style="margin-bottom:0;flex:0 0 auto;min-width:130px;">
@@ -91,7 +91,7 @@
 {% if open_trades %}
 <div class="table-wrap">
 <table>
-  <tr><th>品种</th><th>合约</th><th>类型</th><th>买卖</th><th>行权价</th><th>权利金</th><th>开仓日期</th><th>手续费</th><th>操作</th></tr>
+  <tr><th>品种</th><th>合约</th><th>类型</th><th>买卖</th><th>行权价</th><th>开仓价</th><th>开仓日期</th><th>手续费</th><th>操作</th></tr>
   {% for t in open_trades %}
   <tr>
     <td>{{ t.product_code }}</td>
@@ -164,7 +164,7 @@
 <div class="section-title">已平仓 · {{ closed_trades|length }} 笔</div>
 <div class="table-wrap">
 <table>
-  <tr><th>品种</th><th>合约</th><th>类型</th><th>买卖</th><th>行权价</th><th>开仓</th><th>平仓</th><th>持仓</th><th>权利金</th><th>平仓价</th><th>开仓费</th><th>平仓费</th><th>盈亏</th><th>操作</th></tr>
+  <tr><th>品种</th><th>合约</th><th>类型</th><th>买卖</th><th>行权价</th><th>开仓</th><th>平仓</th><th>持仓</th><th>开仓价</th><th>平仓价</th><th>开仓费</th><th>平仓费</th><th>盈亏</th><th>操作</th></tr>
   {% for t in closed_trades %}
   <tr>
     <td>{{ t.product_code }}</td>
@@ -295,7 +295,7 @@ function hideCloseForm() {
       <input type="date" name="open_date" id="editOpenDate" required style="font-size:0.85rem;">
     </div>
     <div class="form-group">
-      <label>权利金</label>
+      <label>开仓价</label>
       <input type="number" step="any" name="open_price" id="editOpenPrice" required style="font-size:0.9rem;">
     </div>
     <div class="form-group">