fix(knowledge): 统一向量化费用归属说明

tests/unit/cloud-agents-workflows.test.tsx

@@ -118,6 +118,8 @@ it('saves independent Agent ceilings and pages cost results under the active sou
   render(<><CloudBudgetEditor slug={slug} /><CloudCosts slug={slug} applications={[]} /></>);
   const request = await screen.findByLabelText('每次任务上限（词元点数）');
   await waitFor(() => expect(request).toBeEnabled());
+  expect(screen.getByRole('option', { name: '知识库模型调用' })).toBeInTheDocument();
+  expect(screen.getByText(/知识处理触发的对话模型调用仍按实际用量计入费用/)).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');
   fireEvent.change(request, { target: { value: '20.50' } });
   fireEvent.change(screen.getByLabelText('每日上限（词元点数）'), { target: { value: '100' } });
   fireEvent.click(screen.getByRole('button', { name: '保存费用上限' }));