Export a bare-bone 3D viewer

### User Story Description

As a user, I want to be able to export a bare-bone 3D renderer that can be embedded into a stand-alone HTML file. This functionality needs to be available only from the client configuration of VISOR - if the remote rendering configuration does not make it possible, that is an acceptable limitation.

### Acceptance Criteria

Start a client session of VISOR. Load a model. Use the API call to export a bare-bone 3D viewer that can be opened in an HTML file.
That viewer can be embedded as a web component into any HTML file.
The bare-bone viewer does not need to store any state information, nor does he need to share UI / features with VISOR.

### Additional Links

_No response_

### Requires new or update to third party ? If "yes" add the name(s) and the version(s) of the Third Party Software.

No

### Name and Version for Third Parties

_No response_

Begin with the client configuration and session API, then inspect how a loaded model reaches the renderer. Confirm the export entry point can produce a standalone HTML web component from a client session; done means it opens, embeds in arbitrary HTML, and retains no VISOR state or UI.

Scritto dal modello di indicizzazione a partire dal testo della issue.