Fix ZeroGPU preview callbacks to stay CPU-only and avoid main-process CUDA init

Fix HF live streaming callbacks to avoid ZeroGPU scheduling on preview/timer paths

Improve live streaming demo with automatic delayed TTS reply and Chinese UI

Enable live microphone streaming ASR in VoiceDirector demo

fix: expose module-level ZeroGPU GPU callbacks

fix: add ZeroGPU spaces.GPU wrappers

fix: pin torch to a ZeroGPU-supported version

fix: relax torch requirements for ZeroGPU compatibility

demo: package VoiceDirector stage-1 integration app

initial commit