feat(plugin): P2-4 数据导入导出 — 后端 export/import API + 前端 UI + TS 修复

- data_service: export 方法查询匹配行(上限10000)，import 方法逐行校验+插入
- data_handler: export_plugin_data / import_plugin_data 处理函数
- module: 注册 GET /export + POST /import 路由
- pluginData.ts: exportPluginData / importPluginData API 函数
- PluginCRUDPage: 根据 entity importable/exportable 标志显示导出/导入按钮
- PluginMarket: 修复 TS 错误 (unused imports, type narrowing)
- PluginSettingsForm: 修复 TS 错误 (Rule type, Divider orientation)

apps/web/src/pages/PluginMarket.tsx

@@ -10,7 +10,6 @@ import {
   Typography,
   Modal,
   Rate,
-  List,
   message,
   Empty,
   Tooltip,
@@ -21,7 +20,7 @@ import {
   AppstoreOutlined,
   StarOutlined,
 } from '@ant-design/icons';
-import { listPlugins, installPlugin } from '../api/plugins';
+import { listPlugins } from '../api/plugins';
 
 const { Title, Text, Paragraph } = Typography;
 
@@ -108,7 +107,7 @@ export default function PluginMarket() {
     return matchSearch && matchCategory;
   });
 
-  const categories = Array.from(new Set(plugins.map((p) => p.category).filter(Boolean)));
+  const categories = Array.from(new Set(plugins.map((p) => p.category).filter((c): c is string => Boolean(c))));
 
   const showDetail = (plugin: MarketPlugin) => {
     setSelectedPlugin(plugin);