## Refactor
Align the Markdown conversion logic across all business modules：
1. frontend/backend apply: doc to markdown
2. insert/import markdown： use `markdownAdapter.toDoc`
> CLOSE AI-328 AI-379 AI-380
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## Summary by CodeRabbit
* **Documentation**
* Clarified instructions and provided an explicit example for correct
list item formatting in the markdown editing tool.
* **Bug Fixes**
* Improved markdown parsing for lists, ensuring correct indentation and
handling of trailing newlines.
* Cleaned up markdown snapshot test files by removing redundant blank
lines for better readability.
* **Refactor**
* Updated markdown conversion logic to use a new parsing approach for
improved reliability and maintainability.
* Enhanced markdown generation method for document snapshots with
improved error handling.
* Refined markdown-to-snapshot conversion with more robust document
handling and snapshot extraction.
* **Chores**
* Added a new workspace dependency for enhanced markdown parsing
capabilities.
* Updated project references and workspace dependencies to include the
new markdown parsing package.
* **Tests**
* Temporarily disabled two markdown-related tests due to parse errors in
test mode.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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