fix: handle undefined initializationOptions in LSP params

[CatBraaain]

Overview

This change handles the case where initializationOptions is optional and may be undefined, ensuring safe access by providing a default value.

Changes

// Before
const options = params.initializationOptions as InitializationOptions;

// After
const options = (params.initializationOptions ?? {}) as InitializationOptions;

Background

When running via CLI, a runtime error occurred

Server initialization failed.
Message: Request initialize failed with message: Cannot read properties of undefined (reading 'sessionToken')