Extract and API improvements: v1.4.2

We're excited to announce several new features and improvements:
- Added web search capabilities to the extract endpoint via the
enableWebSearchparameter - Introduced source tracking with
__experimental_showSourcesparameter - Added configurable webhook events for crawl and batch operations
- New
timeoutparameter for map endpoint - Optional ad blocking with
blockAdsparameter (enabled by default)
- Enhanced proxy selection and infrastructure reliability
- Added domain checker tool to cloud platform
- Redesigned LLMs.txt generator interface for better usability