The security checks in every Lionshead PR

# Summary Lionshead, a solo-scale software company, implements automated security scanning on every pull request to prevent data breaches before they reach production—something only enterprise companies typically do. The security stack includes multiple scanning tools (Trivy, Gitleaks, Checkov, OWASP ZAP, Actionlint, and Shellcheck) that check for vulnerabilities, hardcoded secrets, insecure infrastructure, and other security issues, with strict rules that block merges if problems are found. This proactive "self-breach" approach is necessary because a real data breach would likely end the product entirely, unlike larger companies that have teams and resources to manage incidents.