docs: update X handle and add X link to README headers

- Fix X (Twitter) URL from OpenCowAI to OpenCow_AI across all docs
- Add X (Twitter) link to header sections in both README files
- Lowercase repo name in CONTRIBUTING.md clone instructions

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

Author: HikoQiu

CONTRIBUTING.md

@@ -17,8 +17,8 @@ Thank you for your interest in contributing to OpenCow! This guide will help you
 1. **Fork and clone** the repository:
 
    ```bash
-   git clone https://github.com/<your-username>/OpenCow.git
-   cd OpenCow
+   git clone https://github.com/<your-username>/opencow.git
+   cd opencow
    ```
 
 2. **Install dependencies** using [pnpm](https://pnpm.io/):

README.md

@@ -22,7 +22,7 @@ ship in parallel. For every team.
 
 [How It Works](#how-it-works) · [Features](#the-platform) · [Quick Start](#quick-start) · [Architecture](#architecture) · [Contributing](#contributing)
 
-**[Website](https://opencow.ai)** · **[Download](https://opencow.ai/download)**
+**[Website](https://opencow.ai)** · **[X (Twitter)](https://x.com/OpenCow_AI)** · **[Download](https://opencow.ai/download)**
 
 </div>
 
@@ -323,7 +323,7 @@ Please read **[CONTRIBUTING.md](CONTRIBUTING.md)** for the full guide on code st
 
 ## Community
 
-- [X (Twitter)](https://x.com/OpenCowAI) — Follow us for updates
+- [X (Twitter)](https://x.com/OpenCow_AI) — Follow us for updates
 - [Discord](https://discord.gg/dDsjwb5pzN) — Chat with the community
 - [GitHub Issues](https://github.com/OpenCowAI/opencow/issues) — Bug reports & feature requests
 - [GitHub Discussions](https://github.com/OpenCowAI/opencow/discussions) — Questions & ideas

README.zh-CN.md

@@ -22,7 +22,7 @@
 
 [工作原理](#工作原理) · [功能特性](#功能特性) · [快速开始](#快速开始) · [架构](#架构) · [参与贡献](#参与贡献)
 
-**[官方网站](https://opencow.ai)** · **[下载](https://opencow.ai/download)**
+**[官方网站](https://opencow.ai)** · **[X (Twitter)](https://x.com/OpenCow_AI)** · **[下载](https://opencow.ai/download)**
 
 </div>
 
@@ -323,7 +323,7 @@ git checkout -b feat/my-feature
 
 ## 社区
 
-- [X (Twitter)](https://x.com/OpenCowAI) — 关注我们获取最新动态
+- [X (Twitter)](https://x.com/OpenCow_AI) — 关注我们获取最新动态
 - [Discord](https://discord.gg/dDsjwb5pzN) — 加入社区交流
 - [GitHub Issues](https://github.com/OpenCowAI/opencow/issues) — Bug 报告与功能请求
 - [GitHub Discussions](https://github.com/OpenCowAI/opencow/discussions) — 问题与想法