docs(readme): add npm version badge to README files

Add npm version badge to both English and Chinese README files for quick version reference.

Co-Authored-By: Hagicode <noreply@hagicode.com>
Signed-off-by: newbe36524 <newbe36524@qq.com>

Author: newbe36524

README.md

@@ -1,5 +1,7 @@
 # ImgBin
 
+[![npm version](https://img.shields.io/npm/v/%40hagicode%2Fimgbin?logo=npm)](https://www.npmjs.com/package/@hagicode/imgbin)
+
 [简体中文](./README_cn.md)
 
 ImgBin is a TypeScript CLI for generating image assets, importing existing images into a managed library, writing searchable metadata, searching managed libraries, creating thumbnails, and running provider-routed multimodal image metadata analysis.

README_cn.md

@@ -1,5 +1,7 @@
 # ImgBin
 
+[![npm version](https://img.shields.io/npm/v/%40hagicode%2Fimgbin?logo=npm)](https://www.npmjs.com/package/@hagicode/imgbin)
+
 [English](./README.md)
 
 ImgBin 是一个 TypeScript CLI，用于生成图片资源、将现有图片导入托管库、编写可搜索的元数据、搜索托管库、创建缩略图，以及运行 provider 路由的多模态图片元数据分析。