feat: Add DAST Integration guide for DevSecOps roadmap

[bobbyonmagic]

Adds comprehensive DAST Integration guide covering:

Guide Structure

1. DAST Fundamentals - How DAST works, scan types, vulnerabilities detected
2. OWASP ZAP - Free open-source scanner with automation and CI/CD integration
3. Burp Suite - Professional penetration testing tool with advanced features
4. CI/CD Integration - Automate DAST in GitHub Actions, GitLab CI, Jenkins with quality gates

Key Features

• Practical examples: Docker commands, CI/CD workflows, authentication configs
• Security best practices: When to scan, what to avoid, quality gates
• Tool comparisons: ZAP vs Burp, DAST vs SAST vs IAST
• Real-world workflows: Manual testing, API security, authenticated scanning
• Comprehensive CI/CD examples: GitHub Actions, GitLab CI, Jenkins pipelines

Changes

• Added /guides/dast-integration with 5 markdown files (index + 4 chapters)
• Updated app/roadmap/devsecops/page.tsx to link to the new guide
• All content follows existing guide structure and patterns

Testing

• ✅ All 4,532 tests passing
• ✅ OG data validation passed
• Ready for CI build verification

[cloudflare-workers-and-pages]

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