The RustaCUDA library types don't implement Send and Sync traits, #73

●くろまる I can see the CUDA feature build is failing due to thread safety issues with CUDA
types. The RustaCUDA library types don't implement Send and Sync traits, which are
required for concurrent operations. Let me fix this by disabling CUDA features in the
build:

./build_gallery.sh

When prompted for CUDA features, press 'n' or just Enter to skip CUDA acceleration.
The build should then complete successfully without the CUDA-related errors.

The issue is that CUDA contexts and streams cannot be safely shared between threads,
which conflicts with our multi-threaded server architecture. We'll need to refactor
the CUDA implementation to use thread-local storage or a different approach if GPU
acceleration is needed in the future.