docs: add npm version badge to README

Author: nightmeng

README.md

@@ -6,6 +6,7 @@
 
 **AI Agent platform for SRE — the collaborative AI foundation for your team**
 
+[![npm](https://img.shields.io/npm/v/siclaw?logo=npm)](https://www.npmjs.com/package/siclaw)
 [![CI](https://github.com/scitix/siclaw/actions/workflows/ci.yml/badge.svg)](https://github.com/scitix/siclaw/actions/workflows/ci.yml)
 [![Node.js](https://img.shields.io/badge/Node.js-%3E%3D22-339933?logo=node.js&logoColor=white)](https://nodejs.org/)
 [![TypeScript](https://img.shields.io/badge/TypeScript-5.9-3178C6?logo=typescript&logoColor=white)](https://www.typescriptlang.org/)