v0.6.0 FastAPI integration

What's Changed

Features:

• Added FastAPI integration by @ArtemShatokhin in #274:
  • Added a new run_fastapi method and a function to deploy agencies and tools as APIs using FastAPI

Fixes and stability enhancements:

• Improved thread cancelling by @ArtemShatokhin in #279
• MCP tools improvements by @ArtemShatokhin in #270
• Modernize project structure and tooling and resolve dependency issues by @bonk1t in #277

Other changes:

• Add Zapier integration documentation by @dumitruPuggle in #271
• Updated docs for MCP changes by @ArtemShatokhin
• Improved documentation clarity and organization by @dumitruPuggle

Full Changelog: v0.5.1...v0.6.0