Enhanced Text-to-SQL CDK Agent with improved cross-environment compatibility

[iut62elec]

This PR enhances the Text-to-SQL Bedrock Agent CDK Enhanced with improved cross-environment compatibility and better dependency management.

Changes Made

• requirements.txt: Added version pinning for all packages to ensure consistency across environments
• package.json: Updated CDK versions from 2.101.1 to 2.200.0+ and added proper package metadata
• setup.sh: Enhanced with error handling, Python version validation, and Node.js 20 LTS support
• .nvmrc: Added for consistent Node.js version across environments
• runtime.txt: Added for Python version specification

Key Improvements

• ✅ Better version consistency across different deployment environments
• ✅ Enhanced error handling in setup script
• ✅ Python version validation before proceeding with setup
• ✅ Updated to Node.js 20 LTS for better stability
• ✅ Clear logging and user guidance throughout setup process

Testing

• Tested successfully in the original development environment
• All CDK deployment functionality preserved
• Enhanced compatibility for new environments

Author

• Pedram Jahangiri @iut62elec