refactor: move record/playback to dedicated page, restore test mode in settings

- New '录制回放' page with sidebar nav entry
- Recording: start/stop/auto, file list with play/export/delete
- Playback: visual bar indicator, opens dashboards to see replayed data
- Settings: restored dev tools section with test mode toggle

static/js/pages/settings.js

@@ -242,7 +242,6 @@ const PageSettings = {
             { id: 'sec-plugins', label: '游戏插件' },
             { id: 'sec-backup', label: '数据备份' },
             { id: 'sec-dev', label: '开发工具' },
-            { id: 'sec-record', label: '录制回放' },
             { id: 'sec-system', label: '系统' },
         ];
 
@@ -260,7 +259,8 @@ const PageSettings = {
 
         '<div class="settings-section" id="sec-backup"><h3>数据备份</h3><div class="settings-row"><div><div class="settings-label">导出全量备份</div><div class="settings-desc">打包仪表盘+场景+配置为 .tsb</div></div><div class="settings-control"><button id="btn-export-backup" class="btn btn-secondary btn-sm">下载 .tsb</button></div></div><div class="settings-row"><div><div class="settings-label">恢复备份</div><div class="settings-desc">从 .tsb 文件恢复</div></div><div class="settings-control"><button id="btn-import-backup" class="btn btn-secondary btn-sm">导入 .tsb</button></div></div></div>' +
 
-        '<div class="settings-section" id="sec-record"><h3>录制与回放</h3><p style="font-size:12px;color:var(--text-tertiary);margin-bottom:10px">录制原始 UDP 流到 .tsr 文件，离线回放调试仪表盘</p><div class="settings-row"><div><div class="settings-label">录制状态</div><div class="settings-desc"><span id="rec-status">未启动</span></div></div><div class="settings-control"><button id="btn-rec-start" class="btn btn-secondary btn-sm">开始录制</button><button id="btn-rec-stop" class="btn btn-danger btn-sm" style="display:none">停止</button></div></div><div style="margin-top:10px"><h4 style="font-size:13px;color:var(--text-secondary);margin-bottom:6px">回放文件</h4><div id="recording-list" style="max-height:200px;overflow-y:auto"></div></div></div>' +
+
+        '<div class="settings-section" id="sec-dev"><h3>开发工具</h3><div class="settings-row"><div><div class="settings-label">UI 测试模式</div><div class="settings-desc">本地随机模拟遥测数据</div></div><div class="settings-control"><label class="switch-label"><input type="checkbox" id="settings-test-mode" ' + (cfg.ui_test_mode?'checked':'') + '><span class="switch-track"></span></label></div></div></div>' +
 
         '<div class="settings-section" id="sec-system"><h3>系统</h3><div class="settings-row"><div><div class="settings-label">重启 TurboSu</div><div class="settings-desc">重新加载所有代码和配置</div></div><div class="settings-control"><button id="btn-restart-server" class="btn btn-danger btn-sm">重启服务</button></div></div></div>' +