Vendored chatterbox: tolerate missing package metadata (no pip install)

Vendor chatterbox + chatterbox_flash, pin torch 2.11 (Blackwell ZeroGPU) — mirrors Turbo Space

Install chatterbox-tts from git (loosened torch pin) for Blackwell ZeroGPU; python 3.12

Use python 3.14 so chatterbox-tts allows torch>=2.9 (Blackwell/ZeroGPU sm_120)

ZeroGPU: avoid CUDA init at import (disable load-time prior forward), force CUDA on Spaces

Robust audio (ffmpeg+runtime example voices), fix block_size=16, force English UI

Fix gradio 6 launch(): drop show_api/ssr_mode, remove Blocks theme

Add Chatterbox-Flash Gradio demo (gradio 6.8.0 to match chatterbox-tts stack)

initial commit