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>

strategy_templates/key_monitor_panel.html

@@ -157,6 +157,14 @@
         <label id="key-breakeven-wrap" style="display:inline-flex;align-items:center;gap:4px;font-size:.85rem;color:#9aa">
             <input type="checkbox" name="breakeven_enabled" value="1" id="key-breakeven-cb"> 移动保本
         </label>
+        <label id="key-time-close-wrap" class="key-time-close-wrap" style="display:inline-flex;align-items:center;gap:4px;font-size:.85rem;color:#9aa">
+            <input type="checkbox" name="time_close_enabled" value="1" id="key-time-close-cb"> 时间平仓
+            <select name="time_close_hours" id="key-time-close-hours" disabled>
+                <option value="1">1h</option>
+                <option value="2">2h</option>
+                <option value="4" selected>4h</option>
+            </select>
+        </label>
         <button type="submit">添加</button>
     </form>
     <details class="tip-collapse key-rule-collapse">
@@ -197,6 +205,9 @@
                     <span class="pos-meta-item">方案: {{ key_sl_tp_mode_label(k) }}</span>
                     {% endif %}
                     <span class="pos-meta-item">保本: {{ '开' if k.breakeven_enabled else '关' }}</span>
+                    {% if k.time_close_enabled and k.time_close_hours %}
+                    <span class="pos-meta-item pos-meta-on">时间平仓: {{ k.time_close_hours }}h</span>
+                    {% endif %}
                 </div>
                 <div class="pos-grid">
                     <div class="pos-cell"><span class="pos-label">现价</span><span class="pos-value" id="key-price-{{ k.id }}">-</span></div>