优化中控科技风界面：登录居中、浮盈配色、默认打开首个客户端。

总览改名期权持仓总览，内容区 1800 居中，去掉左上角仓库名。

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

static/hub.js

@@ -6,6 +6,16 @@
     return (n > 0 ? "+" : "") + n.toFixed(2) + " U";
   }
 
+  function pnlClass(v) {
+    const n = Number(v);
+    if (!Number.isFinite(n) || n === 0) return "pnl-flat";
+    return n > 0 ? "pnl-up" : "pnl-down";
+  }
+
+  function fmtPnlHtml(v) {
+    return '<span class="' + pnlClass(v) + '">' + escapeHtml(fmtPnl(v)) + "</span>";
+  }
+
   function escapeHtml(s) {
     return String(s)
       .replace(/&/g, "&amp;")
@@ -20,8 +30,7 @@
     const items = list.slice(0, 8).map(function (p) {
       const id = escapeHtml(p.inst_id || "");
       const sheets = escapeHtml(String(p.sheets != null ? p.sheets : "—"));
-      const pnl = escapeHtml(fmtPnl(p.pnl_usdt));
-      return "<li>" + id + " · " + sheets + "张 · " + pnl + "</li>";
+      return "<li>" + id + " · " + sheets + "张 · " + fmtPnlHtml(p.pnl_usdt) + "</li>";
     });
     const more =
       list.length > 8
@@ -59,7 +68,7 @@
       escapeHtml(inst.mode || "—") +
       "</td>" +
       "<td>" +
-      escapeHtml(fmtPnl(pnl)) +
+      fmtPnlHtml(pnl) +
       "</td>" +
       "<td>" +
       positionSummary(brief) +