Deduct open position margin from recommend max lots.

Recalculate tradable symbol budgets from remaining margin after CTP usage and refresh the table on position updates.

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

static/js/trade.js

@@ -38,6 +38,7 @@
     var recommendMaxByProduct = {};
     var recommendMaxByCode = {};
     var recRowsRaw = [];
+    var recMeta = {};
     var recSortKey = 'trend';
     var recSortDesc = true;
     var recIndustryFilter = '';
@@ -1454,7 +1455,7 @@
         return counts;
     }
 
-    function updateRecStats(allRows, visibleRows) {
+    function updateRecStats(allRows, visibleRows, meta) {
         var el = document.getElementById('rec-stats');
         if (!el) return;
         var total = (allRows || []).length;
@@ -1464,6 +1465,12 @@
             return;
         }
         var parts = [];
+        if (meta && meta.margin_used > 0) {
+            parts.push(
+                '持仓占用 <strong>' + fmtNum(meta.margin_used) + '</strong> 元，' +
+                '剩余额度 <strong class="text-accent">' + fmtNum(meta.margin_budget_remaining) + '</strong> 元'
+            );
+        }
         if (recIndustryFilter) {
             parts.push('筛选 <strong>' + shown + '</strong> / 共 ' + total + ' 个品种');
         } else {
@@ -1641,15 +1648,28 @@
     function renderRecommendTable() {
         var filtered = filterRecommendRows(recRowsRaw);
         var sorted = sortRecommendRows(filtered);
-        updateRecStats(recRowsRaw, sorted);
+        updateRecStats(recRowsRaw, sorted, recMeta);
         renderRecommendRows(sorted);
     }
 
     function renderRecommendations(data) {
         if (!recommendList || !data) return;
         updateRecommendMaxMaps(data);
+        recMeta = {
+            margin_used: data.margin_used || 0,
+            margin_budget_remaining: data.margin_budget_remaining,
+            margin_budget_total: data.margin_budget_total
+        };
         var recCap = document.getElementById('rec-capital');
         if (recCap && data.capital != null) recCap.textContent = Number(data.capital).toFixed(2);
+        var recMarginHint = document.getElementById('rec-margin-hint');
+        if (recMarginHint) {
+            if (recMeta.margin_used > 0) {
+                recMarginHint.textContent = ' · 已扣持仓占用 ' + fmtNum(recMeta.margin_used) + ' 元';
+            } else {
+                recMarginHint.textContent = '';
+            }
+        }
         var recUpdated = document.getElementById('rec-updated');
         if (recUpdated && data.updated_at) {
             recUpdated.textContent = '每日后台更新 · 最近 ' + data.updated_at;
@@ -1658,7 +1678,7 @@
         recRowsRaw = rows.slice();
         if (!rows.length) {
             recommendList.innerHTML = '<tr><td colspan="' + REC_COLSPAN + '" class="empty-hint">当前资金下暂无推荐品种（每日后台刷新）</td></tr>';
-            updateRecStats([], []);
+            updateRecStats([], [], recMeta);
             return;
         }
         renderRecommendTable();
@@ -1692,7 +1712,7 @@
                 renderRecommendTable();
             });
         }
-        if (recRowsRaw.length) updateRecStats(recRowsRaw, filterRecommendRows(recRowsRaw));
+        if (recRowsRaw.length) updateRecStats(recRowsRaw, filterRecommendRows(recRowsRaw), recMeta);
     }
 
     function connectRecommendStream() {