feat(FlowList): 为删除操作添加确认弹窗并改进错误处理

添加 Popconfirm 组件以防止误删流程，同时优化删除操作的错误提示

frontend/src/pages/FlowList.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useMemo, useState } from 'react'
-import { Button, Modal, Space, Table, message, Typography, Input, Form, Tooltip } from 'antd'
+import { Button, Modal, Space, Table, message, Typography, Input, Form, Tooltip, Popconfirm } from 'antd'
 import { PlusOutlined, ReloadOutlined, DeleteOutlined, EditOutlined, EyeOutlined } from '@ant-design/icons'
 import { useNavigate } from 'react-router-dom'
 import api, { type ApiResp } from '../utils/axios'
@@ -141,7 +141,12 @@ export default function FlowList() {
         <Space>
           <Button type="link" icon={<EditOutlined />} onClick={() => openEdit(row)}>编辑</Button>
           <Button type="link" onClick={() => navigate(`/flows/editor?id=${encodeURIComponent(row.id)}`)}>流程设计</Button>
-          <Button type="link" danger icon={<DeleteOutlined />} onClick={() => onDelete(row)}>删除</Button>
+          <Popconfirm title={`确认删除流程「${row.name}」？`} onConfirm={() => onDelete(row)}>
+            <a className="action-link action-danger">
+              <DeleteOutlined />
+              <span>删除</span>
+            </a>
+          </Popconfirm>
           <Button type="link" icon={<EyeOutlined />} onClick={() => onView(row)}>查看</Button>
         </Space>
       )
@@ -182,8 +187,10 @@ export default function FlowList() {
     try {
       const { data } = await api.delete<ApiResp<boolean>>(`/flows/${row.id}`)
       if (data?.code === 0) {
-        message.success('已删除')
+        message.success('删除成功')
         fetchList(page, pageSize, keyword)
+      } else {
+        throw new Error(data?.message || '删除失败')
       }
     } catch (e: any) {
       message.error(e?.message || '删除失败')