Code review, standards compliance, and feature improvements

[djimit]

…d documentation

Security Fixes (HIGH Severity):

• Fix hardcoded SECRET_KEY in Flask app - now uses environment variable
• Add function validation to prevent arbitrary function execution in JS
• Add path traversal protection in certificate handling
• Fix unsafe JSON parsing with proper error handling

Security Fixes (MEDIUM Severity):

• Add environment variable validation with helpful error messages
• Add request timeouts and proper error handling for HTTP calls
• Fix file handle leaks using context managers
• Add input validation and sanitization for user inputs

Code Quality Improvements:

• Add ESLint configuration for JavaScript/TypeScript linting
• Add Prettier configuration for consistent code formatting
• Add pyproject.toml with Black, Ruff, mypy, and pytest configuration
• Create shared Python utilities module with:
  • env_utils.py: Environment variable handling
  • input_validation.py: Input validation and sanitization
  • api_utils.py: Safe API request wrappers

Documentation:

• Add SECURITY_GUIDELINES.md with best practices for AI applications
• Add ENHANCED_FEATURES_ROADMAP.md with improvement recommendations including new lesson topics, API modernization, and CI/CD enhancements

Files Modified:

• 05-advanced-prompts/{python,javascript}/*
• 06-text-generation-apps/{python,js-githubmodels}/*
• 07-building-chat-applications/js-githubmodels/*
• 08-building-search-applications/{js-githubmodels,scripts}/*
• 09-building-image-applications/python/*
• 11-integrating-with-function-calling/{js-githubmodels,typescript}/*

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👋 Thanks for contributing @djimit! We will review the pull request and get back to you soon.

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