feat: add guided exploration and share user-started MCP backend

apps/showcase_ui/src/app/components/model-settings/model-settings.component.spec.ts

@@ -71,9 +71,9 @@ describe('持久化模型与功能设置', () => {
     expect(input.autocomplete).toBe('off');
     input.value = 'custom/model-v2';
     input.dispatchEvent(new Event('input'));
-    const reasoning = root.querySelector<HTMLSelectElement>('#model-reasoning')!;
-    reasoning.value = 'max';
-    reasoning.dispatchEvent(new Event('change'));
+    const reasoning = root.querySelector<HTMLInputElement>('input[aria-label="思考强度"]')!;
+    reasoning.value = '7';
+    reasoning.dispatchEvent(new Event('input'));
     fixture.detectChanges();
     await fixture.whenStable();
     expect(presets[0].getAttribute('aria-pressed')).toBe('false');
@@ -90,7 +90,7 @@ describe('持久化模型与功能设置', () => {
     reopened.detectChanges();
     await reopened.whenStable();
     expect(reopened.nativeElement.querySelector('#model-name').value).toBe('custom/model-v2');
-    expect(reopened.nativeElement.querySelector('#model-reasoning').value).toBe('max');
+    expect(reopened.nativeElement.querySelector('input[aria-label="思考强度"]').getAttribute('aria-valuetext')).toBe('最高 · max');
   });
 
   it('高级稳定性设置可编辑并保存', async () => {