torch and bitsandbytes pull in hundreds of MB of CUDA libraries
(nvidia_cublas ~423 MB) which are useless on headless servers
without an NVIDIA GPU like the NiPoGi.
- requirements.txt: keep only lightweight essential dependencies
- requirements-optional.txt (new): Orpheus TTS deps (torch, transformers,
bitsandbytes, snac, huggingface_hub)
- Installers and update.sh: show hint about optional deps after install
- ci/package.sh: include requirements-optional.txt in tarball