The default build (default = candle-cuda) load-time-imports the CUDA runtime,
so it crashes on any machine without the toolkit. Add a CUDA release variant
that bundles the redistributable runtime DLLs (cudart/cublas/cublasLt/curand,
verified via dumpbin) so it runs on any NVIDIA machine with just a driver.
- tauri.cuda.conf.json: a 'tauri build --config' overlay (CPU release
untouched) that points the updater at latest-cuda.json so a CUDA install
never self-updates into the CPU build
- windows/cuda-hooks.nsh: NSIS hook embeds the DLLs via File and extracts them
next to phokus.exe, where the Windows loader searches
- build:app:cuda script; cuda-redist/ gitignored (DLLs copied from the toolkit
locally), with a negation so the overlay stays tracked
