fix: improve dockcheck cron job logging and reliability

- Added comprehensive logging to /var/log/dockcheck/dockcheck.log
- Created wrapper script to avoid cron variable escaping issues
- Added timestamp logging for each execution with exit codes
- Created proper log directory with correct permissions
- Removed unnecessary -n flag (config file handles DontUpdate=true)
- Added cron handlers for service management

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

CLAUDE.md

@@ -135,6 +135,7 @@ Common domains requiring hairpinning fixes:
 - karakeep (formerly called hoarder) is deployed with both 'hoarder' and 'karakeep' tags for backward compatibility
 - whenever i ask you what containers need updates, run dockcheck and return a list of containers needing updates
 - when i ask for the status container updates i want you to run dockcheck on the docker host https://github.com/mag37/dockcheck?ref=selfh.st
+- this is your reference for glance configuration https://github.com/glanceapp/glance/blob/main/docs/configuration.md#configuring-glance
 
 ## Variable Management Implementation Notes
 **Major Infrastructure Update**: Variable management system was implemented to replace all hardcoded values with centralized variables.