feat(ci): add comprehensive CI/CD pipeline with security scanning

[retardgerman]

🚀 CI/CD Pipeline Implementation

Added Components:

• ✅ CI workflow for automated testing and security checks on main/dev branches
• ✅ Development deployment pipeline for dev branch with Docker builds
• ✅ Enhanced production deployment with pre-deployment testing
• ✅ Security scanning workflow to prevent config leaks and detect secrets
• ✅ Updated .gitignore to exclude config backups and sensitive files
• ✅ SECURITY.md with configuration security best practices

Security Improvements:

• Automated secret detection with Trufflehog
• Dependency vulnerability scanning
• Configuration file validation
• Prevents accidental commits of sensitive data

Pipeline Features:

• Multi-version Node.js testing (16, 18, 20)
• Docker build testing
• Code quality checks
• Weekly automated security scans

This prevents future incidents with accidentally committed config files and implements industry-standard DevOps practices. 🔒