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-theme-classic/footer.json

@@ -0,0 +1,6 @@
+{
+  "copyright": {
+    "message": "Copyright © 2026 CCW. Built with Docusaurus.",
+    "description": "The footer copyright"
+  }
+}

ccw/docs-site/i18n/zh/docusaurus-theme-classic/navbar.json

@@ -0,0 +1,10 @@
+{
+  "title": {
+    "message": "CCW Help",
+    "description": "The title in the navbar"
+  },
+  "logo.alt": {
+    "message": "CCW Logo",
+    "description": "The alt text of navbar logo"
+  }
+}