feat: add timed position close (1h/2h/4h) for key levels and live orders

Program monitors open positions and market-closes at deadline; UI shows label and countdown on instance and hub boards.

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

manual_trading_hub/static/app.js

@@ -2304,6 +2304,15 @@
       meta.push(
         `<span class="${beOn ? "pos-meta-on" : "pos-meta-off"}">移动保本:${beOn ? "开" : "关"}</span>`
       );
+      if (mo.time_close_enabled) {
+        const tcLabel = mo.time_close_label || `时间平仓 ${mo.time_close_hours || ""}h`;
+        const tcCd = mo.time_close_countdown || "--:--:--";
+        const tcAt = mo.time_close_at_ms != null ? String(mo.time_close_at_ms) : "";
+        meta.push(
+          `<span class="pos-meta-item pos-meta-on pos-time-close-meta" data-close-at-ms="${esc(tcAt)}">` +
+            `${esc(tcLabel)} · 倒计时 <span class="pos-time-close-cd">${esc(tcCd)}</span></span>`
+        );
+      }
     } else {
       meta.push("来源: 交易所持仓");
       meta.push("风格: —");