Add .nvmrc

[skgbafa]

chore: add .nvmrc for Node.js 22

Description

This PR adds an .nvmrc file to specify Node.js version 22 as the recommended runtime for this project. This helps ensure consistent Node.js versions across different development environments and CI/CD pipelines.

Changes

• Added .nvmrc file containing 22 to specify Node.js version 22
• Ensures all contributors and deployment environments use the same Node.js version
• Improves development environment consistency

Benefits

• Eliminates Node.js version mismatches between contributors
• Simplifies onboarding for new developers (they can run nvm use to get the correct version)
• Provides clear documentation of the supported Node.js version
• Enables CI/CD systems to automatically use the specified Node.js version

Testing

• Verified that Node.js 22 is compatible with existing dependencies
• Tested that nvm use correctly switches to Node.js 22 when the file is present