fix login entry fallback

src/components/auth/AuthGate.test.tsx

@@ -216,6 +216,48 @@ test('auth gate does not auto-create a guest account when dev guest switch is no
   expect(await screen.findByText('应用内容')).toBeTruthy();
 });
 
+test('auth gate keeps password entry available when login options are empty', async () => {
+  const user = userEvent.setup();
+
+  authMocks.getCurrentAuthUser.mockResolvedValue({
+    user: null,
+    availableLoginMethods: [],
+  });
+  authMocks.getAuthLoginOptions.mockResolvedValue({
+    availableLoginMethods: [],
+  });
+
+  render(
+    <AuthGate>
+      <ProtectedActionButton onAuthenticated={vi.fn()} />
+    </AuthGate>,
+  );
+
+  await user.click(await screen.findByRole('button', { name: '进入作品' }));
+
+  const dialog = screen.getByRole('dialog', { name: '账号入口' });
+  expect(within(dialog).getByLabelText('密码')).toBeTruthy();
+  expect(within(dialog).queryByText('当前登录入口暂不可用。')).toBeNull();
+});
+
+test('auth gate falls back to password entry when login options request fails', async () => {
+  const user = userEvent.setup();
+
+  authMocks.getAuthLoginOptions.mockRejectedValue(new Error('读取登录方式失败'));
+
+  render(
+    <AuthGate>
+      <ProtectedActionButton onAuthenticated={vi.fn()} />
+    </AuthGate>,
+  );
+
+  await user.click(await screen.findByRole('button', { name: '进入作品' }));
+
+  const dialog = screen.getByRole('dialog', { name: '账号入口' });
+  expect(within(dialog).getByLabelText('密码')).toBeTruthy();
+  expect(within(dialog).queryByText('当前登录入口暂不可用。')).toBeNull();
+});
+
 test('auth gate opens a login modal for protected actions and resumes after login', async () => {
   const user = userEvent.setup();
   const onAuthenticated = vi.fn();