系统设置增加备份恢复：凌晨3点自动备份，保留10天，含 env 与复盘图片。

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

lib/instance/templates/backup_settings_panel.html

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+{# 备份恢复:本地 /root/crypto_okx_backups,凌晨3点自动,保留10天 #}
+<div class="backup-settings" data-backup-root="1">
+    <h2>备份恢复</h2>
+    <p class="settings-subcard-desc muted">
+        含 <code>.env</code>、数据库、期权复盘图片。每天北京时间 <strong>03:00</strong> 自动备份,保留最近
+        <strong>10</strong> 天。目录:
+        <code id="backup-dir-label">/root/crypto_okx_backups</code>
+    </p>
+    <div class="settings-export-links-inline settings-export-links-block" style="gap:8px;margin-bottom:12px">
+        <button type="button" class="btn" id="backup-create-btn">立即备份</button>
+        <button type="button" class="btn-secondary" id="backup-refresh-btn">刷新列表</button>
+        <span class="muted" id="backup-status" style="font-size:.78rem"></span>
+    </div>
+    <div class="table-wrap">
+        <table class="or-trades-table" style="width:100%;font-size:.8rem">
+            <thead>
+                <tr>
+                    <th>文件</th>
+                    <th>时间(北京)</th>
+                    <th>大小</th>
+                    <th>操作</th>
+                </tr>
+            </thead>
+            <tbody id="backup-list-body">
+                <tr><td colspan="4" class="muted">加载中…</td></tr>
+            </tbody>
+        </table>
+    </div>
+</div>
+<script src="/static/instance_backup.js?v=1"></script>
+<script>
+(function () {
+  if (window.InstanceBackup && typeof window.InstanceBackup.boot === "function") {
+    window.InstanceBackup.boot();
+  }
+})();
+</script>