feat(platform): add vehicle data management console

vehicle-data-platform/apps/web/src/components/DataEmpty.tsx

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+import { Empty } from '@douyinfe/semi-ui';
+
+export function DataEmpty({ text = '暂无数据' }: { text?: string }) {
+  return <Empty description={text} style={{ padding: 48 }} />;
+}

vehicle-data-platform/apps/web/src/components/PageHeader.tsx

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+import { Typography } from '@douyinfe/semi-ui';
+
+export function PageHeader({ title, description }: { title: string; description: string }) {
+  return (
+    <div style={{ marginBottom: 16 }}>
+      <Typography.Title heading={3} style={{ margin: 0 }}>
+        {title}
+      </Typography.Title>
+      <Typography.Text type="tertiary">{description}</Typography.Text>
+    </div>
+  );
+}

vehicle-data-platform/apps/web/src/components/StatusTag.tsx

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+import { Tag } from '@douyinfe/semi-ui';
+
+export function StatusTag({ status }: { status: 'ok' | 'warning' | 'error' | 'offline' }) {
+  const map = {
+    ok: { color: 'green' as const, text: '正常' },
+    warning: { color: 'orange' as const, text: '关注' },
+    error: { color: 'red' as const, text: '异常' },
+    offline: { color: 'grey' as const, text: '离线' }
+  };
+  return <Tag color={map[status].color}>{map[status].text}</Tag>;
+}