StableDiffusionCpp Backend Host

[saddam213]

Add a StableDiffusionCpp backend host to Amuse, allowing the application to manage a local stable-diffusion.cpp server and use it for image/video generation.

Tasks

• Start and stop the sd-server.exe process automatically.
• Support backend-specific sd.cpp binaries and server configuration.
• Configure environment variables required by the backend.
• Submits image/video generation jobs through the sd.cpp API.
• Provide asynchronous preview image handling through a bounded channel.
• Clean up the server process, HTTP client, cancellation resources, and background tasks through IAsyncDisposable.
• Support CUDA, Vulkan, ROCm runtime deployment