fix(knowledge): keep computer upload and place creation below it

tests/unit/cloud-knowledge-catalog.test.tsx

@@ -20,6 +20,7 @@ function openCreation() {
 it('explains who configures an empty embedding catalog and refreshes without losing the name', async () => {
   api.call.mockResolvedValueOnce(empty).mockResolvedValueOnce(available);
   openCreation();
+  expect(screen.getByRole('button', { name: '从电脑上传', exact: true })).toBeDisabled();
   expect(await screen.findByText('暂时没有可用的向量模型。Embedding 只在 Yuxi 配置，请联系平台管理员启用后刷新；向量化费用由平台承担，不计入用户用量或智能体费用上限。')).toBeVisible();
   expect(screen.getByRole('combobox', { name: '向量模型' })).toBeDisabled();
   expect(screen.getByText(/上传到知识库的文档可供/)).toHaveTextContent('embedding 向量化由平台承担，不计入用户用量、词元点数或智能体费用上限');