fix(settings): 多模态总开关打开即在 AI 服务与模型展示 Omni 视图

管线模式切换器位于 OmniChannelSection（挂在 kind=all 的 ProvidersSection 内），
而新版 ServicesTab 只有 pipelineMode=multimodal 时才生成 omni 视图——总开关
打开后没有任何入口切换模式，配置区域因此消失（回归）。

availableServiceViews 改为按「总开关」「生效模式」两个条件生成视图：
开关打开即出现 omni 视图（内含传统/多模态切换器），切到多模态模式后才
按既有语义隐藏传统 llm/asr 页。

openless-all/app/src/pages/settings/navigation.test.ts

@@ -85,7 +85,7 @@ assert.deepEqual(
 );
 console.log('settings navigation tests passed');
 
-const omniViews = availableServiceViews(true, true);
+const omniViews = availableServiceViews(true, true, true);
 assert.deepEqual(
   omniViews,
   ['omni', 'models', 'connections'],
@@ -101,12 +101,28 @@ assert.equal(
   'models',
   'pipeline changes do not redirect a user managing local models',
 );
-const phoneViews = availableServiceViews(false, false);
+const enabledTraditionalViews = availableServiceViews(true, false, true);
+assert.deepEqual(
+  enabledTraditionalViews,
+  ['omni', 'llm', 'asr', 'models', 'connections'],
+  'enabling the experiment must surface the Omni view while traditional pages remain',
+);
+assert.equal(
+  resolveServiceView('omni', enabledTraditionalViews),
+  'omni',
+  'the Omni view hosts the pipeline mode switcher',
+);
+const phoneViews = availableServiceViews(false, false, false);
 assert.equal(
   phoneViews.includes('models'),
   false,
   'unsupported local model management is not exposed',
 );
+assert.equal(
+  phoneViews.includes('omni'),
+  false,
+  'a disabled multimodal pipeline hides the Omni view',
+);
 assert.equal(
   resolveServiceView('models', phoneViews),
   'llm',
@@ -117,3 +133,4 @@ assert.equal(
   'llm',
   'leaving Omni returns to a traditional service',
 );
+console.log('settings service view tests passed');

openless-all/app/src/pages/settings/navigation.ts

@@ -62,10 +62,20 @@ export function searchSettingsSections<T extends SearchableSettingsSection>(
 
 export type ServiceViewId = 'llm' | 'asr' | 'omni' | 'models' | 'connections';
 
-export function availableServiceViews(multimodal: boolean, localModels: boolean): ServiceViewId[] {
+/**
+ * 多模态总开关（multimodalPipelineEnabled）打开即展示 omni 视图——
+ * 管线模式（传统 / 多模态）的切换器就在该视图里，否则开关打开后没有任何入口
+ * 进入多模态配置。只有真正切到多模态模式后才隐藏传统 llm/asr 页。
+ */
+export function availableServiceViews(
+  multimodalPipelineEnabled: boolean,
+  multimodalMode: boolean,
+  localModels: boolean,
+): ServiceViewId[] {
   return [
-    ...(multimodal ? ['omni' as const] : ['llm' as const, 'asr' as const]),
-    ...(localModels ? ['models' as const] : []),
+    ...(multimodalPipelineEnabled ? (['omni'] as const) : []),
+    ...(!multimodalMode ? (['llm', 'asr'] as const) : []),
+    ...(localModels ? (['models'] as const) : []),
     'connections',
   ];
 }

openless-all/app/src/pages/settings/tabs.tsx

@@ -87,10 +87,10 @@ export function ServicesTab() {
   const { prefs } = useHotkeySettings();
   const platformCaps = usePlatformCaps();
   const showLocalModel = platformCaps?.supportsLocalAsr === true;
-  const multimodal =
-    prefs?.multimodalPipelineEnabled === true && prefs.pipelineMode === 'multimodal';
+  const multimodalEnabled = prefs?.multimodalPipelineEnabled === true;
+  const multimodal = multimodalEnabled && prefs.pipelineMode === 'multimodal';
   const [view, setView] = useState<ServiceViewId>('llm');
-  const views = availableServiceViews(multimodal, showLocalModel);
+  const views = availableServiceViews(multimodalEnabled, multimodal, showLocalModel);
   const selectedView = resolveServiceView(view, views);
   const contentRef = useRef<HTMLDivElement>(null);