Add cloud-audit - AWS security auditing CLI

## Tool Request - **Name:** cloud-audit - **URL:** https://github.com/gebalamariusz/cloud-audit - **Description:** Open-source AWS security scanner that checks for misconfigurations and generates copy-paste remediation (AWS CLI + Terraform HCL). Built-in diff command for tracking security drift between scans. - **Language:** Python - **License:** MIT - **Install:** `pip install cloud-audit`