✨ feat(security): add automated security alert system
- Add Dependabot config to auto-create security update PRs
- Add daily workflow to check alerts and create GitHub issues
- Group minor/patch updates, keep major updates separate
- Auto-label security PRs for easy tracking
This enables:
1. Automatic PR creation for vulnerable dependencies
2. Daily consolidated security alert issues
3. Integration with Claude Code via gh CLI
Consistent with gxjansen.github.io security setup