Add comprehensive DevSecOps documentation and security examples ...

Merge Request feature-branch into main

What does this MR do and why?

Summary of Changes

This merge request adds comprehensive documentation for a DevSecOps training application. The main addition is CLAUDE.md, which serves as a guide containing build commands, testing procedures, code style guidelines, and documentation standards. The changes also enhance the Dockerfile by intentionally adding security vulnerabilities for educational purposes, including container escape risks and running as root. The README.md is updated to mention additional training vulnerabilities. Most importantly, the app.py file now includes detailed docstrings for several routes that contain intentional security flaws (command injection, SQL injection, and path traversal), clearly marking them as educational examples with testing notes. These changes transform the application into a more comprehensive training tool for teaching developers how to identify and address security vulnerabilities through GitLab's security scanning features.

Add comprehensive DevSecOps documentation and security examples │ │ │ │ This commit enhances the project with: │ │ - Detailed CLAUDE.md guide for development, testing, and security practices │ │ - Improved docstrings and security documentation in application code │ │ - Container security vulnerabilities for training purposes in Dockerfile │ │ - Supply chain attack examples with npm package setup │ │ - CI pipeline improvements with Container and Dependency scanning │ │ - Enhanced test documentation and code clarity

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