DICOM 2D/3D Visualization in Web Using Cornerstone3D (CT + RTSTRUCT)

I am working with a set of DICOM files consisting of CT image series and an accompanying RTSTRUCT file. My goal is to visualize:

CT pixel data in axial, coronal, and sagittal views

RTSTRUCT contours overlaid on the 2D views

A basic 3D visualization of the volume and structures in the 3d

I am currently exploring Cornerstone3D and would like to know:

Are there any existing examples, demos, or reference implementations that show a similar workflow (loading CT + RTSTRUCT and 3D visualization)?

Does Cornerstone3D support RTSTRUCT contour rendering out of the box, or does this require custom implementation?

For a beginner, which JavaScript setup is easier to start with when using Cornerstone3D:

is it possible with Vanilla (core) JavaScript?

Or a framework such as React / Vue / Angular?

Any guidance, examples, or best practices would be greatly appreciated.