Fix npm package and library export

[mjdierkes]

Enable npm publishing and library usage for cursor-api-client by fixing package exports and lazy-loading configuration.

The package was not publishable to npm and could not be used as a library due to incorrect package.json configurations, a missing main export file, and an eager session token load that prevented library imports without pre-configured credentials. This PR resolves these issues, making the package a proper npm library.

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Summary by cubic

Fixed npm publishing and library usage for cursor-api-client by correcting package exports, adding a main export file, and making session token loading lazy.

• Refactors

  • Updated package.json exports and entry points for proper library and CLI use.
  • Added src/index.ts to enable clean imports for library consumers.
  • Changed config to load the session token only when needed.

• Documentation

  • Improved README with clear npm install instructions and library usage examples.