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/guide/quick-start.mdx

@@ -26,7 +26,7 @@ description: 使用脚本一键安装和管理 CowAgent
 
 1. 检查 Python 环境（需要 Python 3.7+）
 2. 安装必要工具（git、curl 等）
-3. 克隆项目代码到 `~/chatgpt-on-wechat`
+3. 克隆项目代码到 `~/CowAgent`
 4. 安装 Python 依赖和 Cow CLI
 5. 引导配置 AI 模型和通信渠道
 6. 启动服务