security-audit

Comprehensive security review to identify and fix vulnerabilities in codebase.

1. Dependency audit: Check for known vulnerabilities, update outdated packages, review third-party dependencies
2. Code security review: Check for common vulnerabilities, review authentication/authorization, audit data handling practices
3. Infrastructure security: Review environment variables, check access controls, audit network security, verify dependencies updated and secure, no hardcoded secrets, input validation implemented, authentication secure, authorization properly configured