feat: 实现虚拟列表、拖拽排序、实时预览防抖，更新文档

- DataPreview: 大数据量(>100条)自动启用虚拟滚动，仅渲染可见区域
- FieldList: 基于 @dnd-kit/sortable 实现拖拽排序
- index.tsx: 配置变更时300ms防抖生成预览数据
- ui-design.md: 去除平板/移动端响应式、快捷键，更新交互说明
- technical-implementation.md: 去除downloadAsZip，更新虚拟列表说明

public/_locales/zh_CN/messages.json

@@ -7,7 +7,6 @@
     "message": "清理",
     "description": "Translation key: buttons_clear"
   },
-
   "messages_copySuccess": {
     "message": "已复制到剪贴板",
     "description": "Translation key: messages_copySuccess"
@@ -896,7 +895,6 @@
     "message": "在标签页打开",
     "description": "Translation key: buttons_openInTab"
   },
-
   "common_errorBoundary_title": {
     "message": "糟糕，出了点问题",
     "description": "Translation key: errorBoundary_title"
@@ -1188,5 +1186,11 @@
   "testDataGenerator_delete": {
     "message": "删除",
     "description": "Translation key: testDataGenerator_delete"
+  },
+  "testDataGenerator_virtualMode": {
+    "message": "虚拟列表模式（共 $ 行）"
+  },
+  "testDataGenerator_totalRows": {
+    "message": "共 $ 条数据"
   }
 }