Don't know of anything like this, but this is a really good idea! It would be sweet to have a scene and renderer with well-known properties (which could be adjusted to account for style; realistic/toon/dynamic lighting/baked lighting, etc) which could be dropped in to a webpage so that users could mess with it. That way, developers could independently include it and write their own ways of injecting the assets.

The end result being a web widget that is a 3D environment with whatever the developer wants to put in it (with some defaults like "sunny outside", "sun room", "basement", "cave", etc), and drag-and-drop asset selection for users to view the showcased assets in the scene. Could even double as a code-guide, based on your idea of including functioning TV and Radio assets (an example of how to include this functionality into the assets). Overall, just a really great idea!

I've considered something like this for years. A simple, casual, social space to just decorate, hang out, do basic stuff like what you outline. I think there's a lot of potential there! Not so much money though, I imagine...

Second Life is still a thing, or OpenSimulator if you really do want to do it all yourself :)

FWIW, SL is finalizing the addition of PBR textures now and may go further WRT scene imports.

I know one shouldn't judge an entire community like this, but every interaction I've had with SL has been... strange, to put it lightly. Still, I have a lot of respect for those devs and their commitment to the game

OpenSimulator looks like a cool idea too!

That Virtual Room can easily created with Unreal Engine. I believe you can find some ready environments like this on Unreal Engine Marketplace.