feat: add chat onboarding entry (#7109)

Upstream: https://github.com/toeverything/blocksuite/pull/7161

packages/frontend/core/src/components/blocksuite/block-suite-editor/ai/setup-provider.tsx

@@ -8,6 +8,7 @@ import { assertExists } from '@blocksuite/global/utils';
 import { AIProvider } from '@blocksuite/presets';
 import { getCurrentStore } from '@toeverything/infra';
 
+import { toggleGeneralAIOnboarding } from '../../../affine/ai-onboarding/apis';
 import type { PromptKey } from './prompt';
 import {
   createChatSession,
@@ -390,6 +391,8 @@ Could you make a new website based on these notes and send back just the html fi
     },
   });
 
+  AIProvider.provide('onboarding', toggleGeneralAIOnboarding);
+
   AIProvider.slots.requestUpgradePlan.on(() => {
     getCurrentStore().set(openSettingModalAtom, {
       activeTab: 'billing',