feat(web): 健康模块通用组件 8 个

- StatusTag: 通用状态标签（预约/随访/咨询/患者状态）
- PatientSelect: 患者远程搜索选择器
- DoctorSelect: 医护远程搜索选择器
- VitalSignsChart: ECharts 趋势图（可切换指标）
- CalendarView: 日历视图（排班展示）
- ChatBubble: 聊天气泡（角色区分左右布局）
- ImagePreview: 图片预览（Ant Design Image.PreviewGroup）
- ExportButton: 导出按钮（blob 下载）

apps/web/src/pages/health/components/ExportButton.tsx

@@ -0,0 +1,45 @@
+import { Button, message } from 'antd';
+import { DownloadOutlined } from '@ant-design/icons';
+
+interface Props {
+  fetchUrl: string;
+  params?: Record<string, string>;
+  filename?: string;
+  label?: string;
+}
+
+export function ExportButton({
+  fetchUrl,
+  params,
+  filename,
+  label = '导出',
+}: Props) {
+  const handleExport = async () => {
+    try {
+      const query = params
+        ? '?' + new URLSearchParams(params).toString()
+        : '';
+      const token = localStorage.getItem('access_token');
+      const resp = await fetch(`/api/v1${fetchUrl}${query}`, {
+        headers: token ? { Authorization: `Bearer ${token}` } : {},
+      });
+      if (!resp.ok) throw new Error('导出失败');
+      const blob = await resp.blob();
+      const url = URL.createObjectURL(blob);
+      const a = document.createElement('a');
+      a.href = url;
+      a.download = filename ?? `export_${Date.now()}.csv`;
+      a.click();
+      URL.revokeObjectURL(url);
+      message.success('导出成功');
+    } catch {
+      message.error('导出失败');
+    }
+  };
+
+  return (
+    <Button icon={<DownloadOutlined />} onClick={handleExport}>
+      {label}
+    </Button>
+  );
+}