Add ability to store API keys in configuration

[bhouston]

Add ability to store API keys in configuration

Description

This PR implements the functionality requested in issue #134, allowing users to store API keys in the configuration file as an alternative to setting environment variables.

Changes

• Added API key fields to the default configuration in config.ts
• Updated the API key retrieval logic in $default.ts to check both the config file and environment variables
• Added special handling for API keys in the config command with security warnings and confirmation
• Added example to the help text for setting API keys

Security Considerations

• Added warnings about the security implications of storing API keys in plaintext
• Added a confirmation prompt before storing API keys
• Environment variables still take precedence over stored configuration

Testing

• Manually tested setting and using API keys from configuration
• Verified that the confirmation prompt works correctly
• Confirmed that environment variables take precedence when both are set

Related Issues

Fixes #134

[github-actions]

🎉 This PR is included in version mycoder-v1.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀