feat(agents): 支持个人微信发布与渠道会话

tests/unit/cloud-wechat-qr.test.tsx

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+import { render, screen, waitFor } from '@testing-library/react';
+import { CloudWechatQr } from '@/pages/CloudAgents/CloudWechatQr';
+
+describe('CloudWechatQr', () => {
+  it('generates an SVG QR locally from the provider login URL', async () => {
+    render(<CloudWechatQr value="https://wechat.example.test/login?ticket=abc" />);
+
+    const qr = await screen.findByAltText('个人微信登录二维码');
+    expect(qr.tagName).toBe('IMG');
+    expect(qr.getAttribute('src')).toMatch(/^data:image\/svg\+xml;charset=utf-8,/);
+    expect(qr.getAttribute('width')).toBe('192');
+    expect(qr.getAttribute('height')).toBe('192');
+  });
+
+  it('does not show the previous QR while the value changes', async () => {
+    const view = render(<CloudWechatQr value="https://wechat.example.test/login?ticket=old" />);
+    await screen.findByAltText('个人微信登录二维码');
+
+    view.rerender(<CloudWechatQr value="https://wechat.example.test/login?ticket=new" />);
+    expect(screen.queryByAltText('个人微信登录二维码')).toBeNull();
+    expect(screen.getByRole('status')).toHaveTextContent('正在生成二维码');
+    await waitFor(() => expect(screen.getByAltText('个人微信登录二维码')).toBeInTheDocument());
+  });
+
+  it('shows a Chinese error when QR generation fails', async () => {
+    render(<CloudWechatQr value={'x'.repeat(5000)} />);
+
+    expect(await screen.findByRole('alert')).toHaveTextContent('二维码生成失败，请重试');
+  });
+});