fix: bound task failures and release stalled workers

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

@@ -138,7 +138,7 @@ describe('持久化模型与功能设置', () => {
   });
 
   it('录屏与视频分析独立保存，重新打开后保留各自状态', () => {
-    const capabilities = { video_enabled: true, recording_enabled: false, outputter_enabled: true, step_summarizer_enabled: false, screenshot_limit_enabled: true, screenshot_max_long_edge: 2048 };
+    const capabilities = { video_enabled: true, recording_enabled: false, outputter_enabled: true, step_summarizer_enabled: false, screenshot_limit_enabled: true, screenshot_max_long_edge: 2048, task_timeout_seconds: 1800, observation_timeout_seconds: 60, observation_max_attempts: 3, device_command_timeout_seconds: 10, action_failure_attempts: 3, worker_cleanup_timeout_seconds: 30 };
     const fixture = TestBed.createComponent(CapabilitySettingsComponent);
     fixture.detectChanges();
     http.expectOne('/api/system/capability-settings').flush(capabilities);
@@ -160,4 +160,34 @@ describe('持久化模型与功能设置', () => {
     expect(reopened.componentInstance.config.recording_enabled).toBeTrue();
     expect(reopened.componentInstance.config.screenshot_limit_enabled).toBeFalse();
   });
+
+  it('执行保护默认折叠，修改时限可保存且拒绝无效数值', async () => {
+    const capabilities = { video_enabled: false, recording_enabled: false, outputter_enabled: true, step_summarizer_enabled: true, screenshot_limit_enabled: true, screenshot_max_long_edge: 2048, task_timeout_seconds: 1800, observation_timeout_seconds: 60, observation_max_attempts: 3, device_command_timeout_seconds: 10, action_failure_attempts: 3, worker_cleanup_timeout_seconds: 30 };
+    const fixture = TestBed.createComponent(CapabilitySettingsComponent);
+    fixture.detectChanges();
+    http.expectOne('/api/system/capability-settings').flush(capabilities);
+    fixture.detectChanges();
+    await fixture.whenStable();
+    const root: HTMLElement = fixture.nativeElement;
+    expect(root.querySelector<HTMLDetailsElement>('.execution-settings')!.open).toBeFalse();
+    root.querySelector<HTMLElement>('summary')!.click();
+    const timeout = root.querySelector<HTMLInputElement>('input[type="number"]')!;
+    timeout.value = '3600';
+    timeout.dispatchEvent(new Event('input'));
+    fixture.detectChanges();
+    await fixture.whenStable();
+    root.querySelector<HTMLButtonElement>('button')!.click();
+    const request = http.expectOne('/api/system/capability-settings');
+    expect(request.request.body.task_timeout_seconds).toBe(3600);
+    expect(request.request.body.observation_timeout_seconds).toBe(60);
+    request.flush({ ...capabilities, task_timeout_seconds: 3600 });
+    expect(fixture.componentInstance.message()).toContain('已保存');
+    timeout.value = '0';
+    timeout.dispatchEvent(new Event('input'));
+    fixture.detectChanges();
+    await fixture.whenStable();
+    expect(root.querySelector<HTMLButtonElement>('button')!.disabled).toBeTrue();
+    fixture.componentInstance.save();
+    http.expectNone('/api/system/capability-settings');
+  });
 });