feat: 品种推荐与下单显示主力合约

推荐列表展示当前主力代码；下单品种支持中文/代码搜索并按交易所分组选择主力合约。

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

templates/trade.html

@@ -37,9 +37,10 @@
 
                     <div class="trade-form-rows">
                         <div class="trade-form-line line-3">
-                            <div class="symbol-wrap trade-field">
+                            <div class="symbol-wrap trade-field symbol-mains">
                                 <label class="text-label">品种</label>
-                                <input type="text" id="trade-symbol" class="symbol-input" placeholder="主力合约 rb2610" autocomplete="off">
+                                <input type="text" id="trade-symbol" class="symbol-input" placeholder="输入中文或代码，选择主力合约" autocomplete="off">
+                                <input type="hidden" id="trade-symbol-code" class="symbol-ths-code">
                                 <div class="symbol-dropdown"></div>
                                 <div class="symbol-selected" id="sym-selected"></div>
                             </div>
@@ -120,7 +121,7 @@
                             {% if recommend_rows %}
                             {% for r in recommend_rows %}
                             <tr class="rec-{{ r.status }}">
-                                <td><strong>{{ r.name }}</strong> <span class="text-muted">{{ r.ths }}</span></td>
+                                <td><strong>{{ r.name }}</strong> <span class="text-accent">{{ r.main_code or r.ths }}</span></td>
                                 <td>{{ r.exchange }}</td>
                                 <td>{% if r.price %}{{ r.price }}{% else %}—{% endif %}</td>
                                 <td>{% if r.margin_one_lot %}{{ r.margin_one_lot }}{% else %}—{% endif %}</td>