release layout: archive c3 under releases/archived/ (keep only latest cut at root)

c4: sbsa side-load DSO

c4: x86_64 side-load DSO

Upload dso/0.10.3-c3/ggml-cuda-sbsa-aarch64.so with huggingface_hub

c3: standalone side-load CUDA DSO (x86_64-linux, for the -win/bare variant)