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/build/zh/assets/js/723.50d99bed.js

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