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/.docusaurus/site-metadata.json

@@ -12,9 +12,9 @@
       "name": "@docusaurus/plugin-content-pages",
       "version": "3.9.2"
     },
-    "docusaurus-plugin-sitemap": {
+    "docusaurus-plugin-debug": {
       "type": "package",
-      "name": "@docusaurus/plugin-sitemap",
+      "name": "@docusaurus/plugin-debug",
       "version": "3.9.2"
     },
     "docusaurus-plugin-svgr": {