### TL;DR
Relocated AI-related code from `presets` directory to a dedicated `ai` directory for better organization and maintainability.
### What changed?
- Moved AI-related code from `blocksuite/presets/ai` to `blocksuite/ai`
- Relocated AI chat block code from `blocksuite/blocks` to `blocksuite/ai/blocks`
- Updated imports across files to reflect new directory structure
- Renamed `registerBlocksuitePresetsCustomComponents` to `registerAIEffects`
- Fixed path references in GitHub workflow file
### How to test?
1. Build and run the application
2. Verify AI functionality works as expected:
- Test AI chat blocks
- Check AI panel functionality
- Verify AI copilot features
- Ensure AI-related UI components render correctly
### Why make this change?
This restructuring improves code organization by:
- Giving AI features a dedicated directory that better reflects their importance
- Making the codebase more maintainable by grouping related AI functionality
- Reducing confusion by removing AI code from the more general `presets` directory
- Creating clearer boundaries between AI and non-AI related code
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