Import Statement Refactoring

Modernized Node.js module imports to use more specific named imports instead of default imports, improving code clarity and enabling better tree-shaking:

• stream module: Changed to named import of PassThrough
• node:child_process: Changed to named imports of execSync and spawn
• node:os: Changed to named import of homedir
• node:process: Changed to named import of cwd

These changes have no user-visible impact but improve code maintainability and bundle optimization.