feat: add configuration backup, sync, and version checker services

- Implemented ConfigBackupService for backing up local configuration files.
- Added ConfigSyncService to download configuration files from GitHub with remote-first conflict resolution.
- Created VersionChecker to check application version against the latest GitHub release with caching.
- Introduced security validation utilities for input validation to prevent common vulnerabilities.
- Developed utility functions to start and stop Docusaurus documentation server.

ccw/docs-site/i18n/zh/docusaurus-plugin-content-docs/current/index.mdx

@@ -0,0 +1,40 @@
+---
+title: CCW 帮助文档
+sidebar_label: 首页
+sidebar_position: 1
+---
+
+import Link from '@docusaurus/Link';
+
+# 欢迎使用 CCW 帮助文档
+
+<div className="row">
+  <div className="col col--6">
+    <div className="card padding--md">
+      <div className="card__header">
+        <h3>工作流</h3>
+      </div>
+      <div className="card__body">
+        <p>探索 15 个工作流级别，从快速执行到智能编排</p>
+        <Link to="/docs/zh/workflows/introduction">开始使用</Link>
+      </div>
+    </div>
+  </div>
+  <div className="col col--6">
+    <div className="card padding--md">
+      <div className="card__header">
+        <h3>命令</h3>
+      </div>
+      <div className="card__body">
+        <p>完整命令参考，涵盖工作流、issue、CLI 和内存操作</p>
+        <Link to="/docs/zh/commands/general/ccw">浏览命令</Link>
+      </div>
+    </div>
+  </div>
+</div>
+
+## 快速链接
+
+- [工作流介绍](/docs/zh/workflows/introduction)
+- [命令参考](/docs/zh/commands/general/ccw)
+- [常见问题](/docs/zh/faq)