docs: add lab9 submission

[Aleliya]

Goal

Complete Lab 9 on DevSecOps: performing security scanning of a web application and container image using OWASP ZAP and Trivy, vulnerability analysis.

Changes

• The vulnerable Juice Shop application was scanned using OWASP ZAP
• Container image was scanned using Trivy
• Analysis of the results is provided

Testing

• Clone the repository and checkout the feature/lab9 branch
• Navigate to labs/submission9.md
• Run the zap-report.html to see report

Checklist:

• Clear title and description
• Documentation/README updated if needed
• No secrets or large temporary files

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• Task 1 — Web Application Scanning with OWASP ZAP
• Task 2 — Container Vulnerability Scanning with Trivy