* feat: add copy page button functionality and fix llms-text output
- Add copy page button with CSS and JS implementation
- Implement copy page hooks for MkDocs integration
- Fix HTML filtering and DOM text reinterpreted as HTML issues
- Update llms-text target to generate docs/llm.txt instead of docs/llms-full.txt
- Add necessary styling and package.json dependencies
* fix missing button in preview
* remove the over-processing
* disable API reference
