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.

package.json

@@ -5,8 +5,8 @@
   "type": "module",
   "main": "ccw/src/index.js",
   "bin": {
-    "ccw": "./ccw/bin/ccw.js",
-    "ccw-mcp": "./ccw/bin/ccw-mcp.js"
+    "ccw": "ccw/bin/ccw.js",
+    "ccw-mcp": "ccw/bin/ccw-mcp.js"
   },
   "workspaces": [
     "ccw/frontend",