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>

static/js/trade.js

@@ -34,6 +34,9 @@
     }
 
     function selectedSymbol() {
+        var codeEl = document.getElementById('trade-symbol-code');
+        var code = codeEl && codeEl.value ? codeEl.value.trim() : '';
+        if (code) return code;
         return (symInput && symInput.value || '').trim();
     }
 
@@ -389,7 +392,7 @@
         recommendList.innerHTML = rows.map(function (r) {
             return (
                 '<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 || r.ths || '') + '</span></td>' +
                 '<td>' + (r.exchange || '') + '</td>' +
                 '<td>' + (r.price != null ? r.price : '—') + '</td>' +
                 '<td>' + (r.margin_one_lot != null ? r.margin_one_lot : '—') + '</td>' +
@@ -419,7 +422,13 @@
         });
     });
 
-    if (symInput) symInput.addEventListener('input', function () { scheduleQuote(); scheduleAutoCalc(); });
+    if (symInput) {
+        symInput.addEventListener('input', function () { scheduleQuote(); scheduleAutoCalc(); });
+        symInput.addEventListener('symbol-selected', function () {
+            scheduleQuote();
+            scheduleAutoCalc();
+        });
+    }
     if (lotsInput) lotsInput.addEventListener('input', scheduleQuote);
     if (slInput) slInput.addEventListener('input', scheduleAutoCalc);
     if (tpInput) tpInput.addEventListener('input', scheduleAutoCalc);