合约代码改为下拉选择月份，名称简化为年月

ft-app/app/templates/admin.html

@@ -140,12 +140,17 @@
     <form method="post" action="/admin/contract" style="display:flex;gap:12px;align-items:flex-end;flex-wrap:wrap;">
       <input type="hidden" name="product_id" value="{{ p.id }}">
       <div class="form-group" style="margin-bottom:0;flex:1;min-width:140px;">
-        <label>合约代码 <span style="font-weight:400;color:var(--sub);font-size:0.75rem;">品种代码 + 月份</span></label>
-        <input type="text" name="code" required placeholder="如 {{ p.code }}2609" maxlength="10" style="text-transform:uppercase;">
+        <label>合约代码</label>
+        <select name="code" required style="text-transform:uppercase;">
+          <option value="">-- 选择月份 --</option>
+          {% for ym in ['2609','2610','2611','2612','2701','2702','2703','2704','2705','2706','2707','2708'] %}
+          <option value="{{ p.code }}{{ ym }}">{{ p.code }}{{ ym }}</option>
+          {% endfor %}
+        </select>
       </div>
-      <div class="form-group" style="margin-bottom:0;flex:2;min-width:160px;">
-        <label>合约名称 <span style="font-weight:400;color:var(--sub);font-size:0.75rem;">品种名 + 月份</span></label>
-        <input type="text" name="name" required placeholder="如 {{ p.name }}2609">
+      <div class="form-group" style="margin-bottom:0;flex:1;min-width:100px;">
+        <label>名称</label>
+        <input type="text" name="name" required placeholder="2609" maxlength="4" style="text-transform:uppercase;">
       </div>
       <button type="submit" class="btn btn-primary">添加合约</button>
     </form>