feat: rename repository name from chatgpt-on-wechat to CowAgent

- Update GitHub URLs in README.md (badges, release links, clone address, wiki, issues, contributors)
- Add project rename notice with SEO keywords and git remote update command
- Update docs/docs.json GitHub links
- Update all docs (zh/en/ja) across guide, intro, models, releases, skills
- Update run.sh and scripts/run.ps1 clone URLs and directory names
- Docker image name (zhayujie/chatgpt-on-wechat) kept unchanged for compatibility

docs/intro/index.mdx

@@ -10,7 +10,7 @@ description: CowAgent - 基于大模型的超级AI助理
 CowAgent 支持灵活切换多种模型，能处理文本、语音、图片、文件等多模态消息，可接入微信、飞书、钉钉、企业微信应用、微信公众号、网页中使用，7×24小时运行于你的个人电脑或服务器中。
 
 <CardGroup cols={2}>
-  <Card title="GitHub" icon="github" href="https://github.com/zhayujie/chatgpt-on-wechat">
+  <Card title="GitHub" icon="github" href="https://github.com/zhayujie/CowAgent">
     开源代码仓库，欢迎 Star 和贡献
   </Card>
   <Card title="免部署在线体验" icon="cloud" href="https://link-ai.tech/cowagent/create">