Add cloud-audit - AWS security scanner with Terraform remediation

[gebalamariusz]

Adds cloud-audit to the Cloud/Terraform category.

cloud-audit is an open-source AWS security scanner (MIT license) that generates Terraform remediation code for every finding. Key features:

• 47 curated checks covering IAM, S3, EC2, RDS, VPC, Lambda, KMS
• Each finding includes both AWS CLI and Terraform fix code
• Attack chain detection (correlates findings into multi-step attack paths)
• Diff command for tracking security posture changes
• SARIF output for GitHub Code Scanning
• Tags: cloud, terraform, configmanagement