chore: switch to MIT license for wider adoption (v2.4.0)

- Changed from Sustainable Use License to MIT License
- Added attribution to Romuald Czlonkowski @ www.aiadvisors.pl/en
- Created ATTRIBUTION.md with easy attribution examples
- Updated package.json, README.md, and CLAUDE.md
- Added GitHub stars badge to encourage community support
- Bumped version to 2.4.0 to mark this significant change

This change allows:
✅ Unrestricted use in personal and commercial projects
✅ Easy integration into corporate environments
✅ Freedom to modify and distribute
✅ Hosting as a service without restrictions

The project remains focused on helping n8n builders work more efficiently.

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -1,8 +1,9 @@
 # n8n-MCP
 
-[![Version](https://img.shields.io/badge/version-2.3.3-blue.svg)](https://github.com/czlonkowski/n8n-mcp)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+[![GitHub stars](https://img.shields.io/github/stars/czlonkowski/n8n-mcp?style=social)](https://github.com/czlonkowski/n8n-mcp)
+[![Version](https://img.shields.io/badge/version-2.4.0-blue.svg)](https://github.com/czlonkowski/n8n-mcp)
 [![Docker](https://img.shields.io/badge/docker-ghcr.io%2Fczlonkowski%2Fn8n--mcp-green.svg)](https://github.com/czlonkowski/n8n-mcp/pkgs/container/n8n-mcp)
-[![License](https://img.shields.io/badge/license-Sustainable%20Use-orange.svg)](LICENSE)
 
 A Model Context Protocol (MCP) server that provides AI assistants with comprehensive access to n8n node documentation, properties, and operations. Deploy locally or remotely to give Claude and other AI assistants deep knowledge about n8n's 525+ workflow automation nodes.
 
@@ -310,13 +311,9 @@ See [CHANGELOG.md](./docs/CHANGELOG.md) for full version history.
 
 ## 📦 License
 
-This project uses the Sustainable Use License. Key points:
-- ✅ Free for internal business and personal use
-- ✅ Modifications allowed for own use
-- ❌ Cannot host as a service without permission
-- ❌ Cannot include in commercial products without permission
+MIT License - see [LICENSE](LICENSE) for details.
 
-See [LICENSE](./LICENSE) for full details.
+**Attribution appreciated!** If you use n8n-MCP, consider giving it a ⭐ star on GitHub or mentioning it in your project. See [ATTRIBUTION.md](ATTRIBUTION.md) for easy ways to give credit.
 
 ## 🤝 Contributing