Support all GitLab webhook events without alert rules

Changes:
- Added support for all GitLab events: Pipeline, Push, Tag, MR, Issue, Job, Wiki, Deployment, Release
- Removed alert rules dependency - webhook sends to all enabled channels directly
- Added proper TypeScript interfaces for all event types
- Enhanced message formatting for each event type
- Added color coding for Discord embeds
- Improved error handling and logging

Supported Events:
✅ Pipeline events (success, failed, running, canceled)
✅ Push events
✅ Tag push events
✅ Merge Request events (open, merge, close)
✅ Issue events (+ confidential)
✅ Job/Build events
✅ Wiki page events
✅ Deployment events
✅ Release events

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

Co-Authored-By: Claude <[email protected]>

Author: ismoilovdevml