refactor(core): call copilot in tools (#13024)

fix AI-298

#### PR Dependency Tree


* **PR #13024** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

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

## Summary by CodeRabbit

* **New Features**
* Document and code artifact generation tools now use a single prompt
field for user input, enabling more flexible content creation powered by
AI.

* **Bug Fixes**
* Improved error handling for missing prompt templates or providers
during document and code artifact generation.

* **Refactor**
* Simplified input schemas for document and code artifact tools,
consolidating multiple input fields into a single prompt.
* Output schemas updated to remove metadata and other unused fields for
a cleaner result.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/blocksuite/ai/components/ai-tools/doc-compose.ts

@@ -39,7 +39,6 @@ interface DocComposeToolResult {
         title: string;
         markdown: string;
         wordCount: number;
-        metadata: Record<string, unknown>;
       }
     | ToolError
     | null;