feat(core): add o4-mini model (#12175)

Close [AI-85](https://linear.app/affine-design/issue/AI-85)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
	- Enhanced AI chat experience with improved web search integration, including a new "AUTO" mode that allows the AI to search the web only when needed.
	- Updated AI model for chat to "o4-mini" for improved performance.
- **Improvements**
	- Refined instructions to reduce hallucinations and ensure the AI admits uncertainty when unsure.
	- Enhanced streaming responses to display web search queries and results more clearly.
	- Updated web search tool modes for more accurate and flexible search behavior.
	- Centralized AI provider options and improved tool selection logic for better response quality.
- **Bug Fixes**
	- Improved handling of tool calls and reasoning steps in AI chat responses.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/blocksuite/ai/provider/setup-provider.tsx

@@ -96,7 +96,7 @@ export function setupAIProvider(
       params: {
         docs: contexts?.docs,
         files: contexts?.files,
-        searchMode: webSearch ? 'MUST' : 'CAN',
+        searchMode: webSearch ? 'MUST' : 'AUTO',
       },
     });
   });