fix: exchange-specific volume rank APIs for OKX and full top20

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

manual_trading_hub/static/chart.js

@@ -2621,14 +2621,23 @@
     elVolRankList.innerHTML = "";
     if (!data || !data.ok || !data.items || !data.items.length) {
       elVolRankMeta.textContent =
-        (data && data.msg) || "暂无排名数据（请稍后或检查实例 /api/hub/volume-rank）";
+        (data && data.msg) ||
+        "暂无排名数据（请 pm2 restart 四实例与 manual-trading-hub 后重试）";
       return;
     }
     const resetHour = data.reset_hour != null ? data.reset_hour : 8;
     const rankDate = data.rank_date || "—";
     const updated = data.updated_at || "—";
+    const total = data.total_symbols != null ? data.total_symbols : "";
     elVolRankMeta.textContent =
-      "昨日成交 Top20 · 交易日 " + rankDate + " · 每早 " + resetHour + ":00 更新 · " + updated;
+      "昨日成交 Top20 · 交易日 " +
+      rankDate +
+      " · 每早 " +
+      resetHour +
+      ":00 更新" +
+      (total ? " · 全市场 " + total + " 个" : "") +
+      " · " +
+      updated;
     const curSym = (elSymbol && elSymbol.value.trim().toUpperCase()) || "";
     data.items.forEach(function (row) {
       const li = document.createElement("li");