fix: dark-mode text color override for Citrus theme

Fix: canonical /edit_video API endpoint (7 inputs) + input-scaled GPU duration (~68s worst case vs fixed 300)

Gradio 6 API: theme/css on launch(), drop show_download_button/show_api

Never .to() a torchao-quantised param (ZeroGPU empty_like on Float8Tensor)

diffusers>=0.39 (0.36 crashes on torchao 0.18 NF4Tensor import)

Unpin transformers (gradio 6 requires huggingface-hub>=1.16); transformers v5 compat

Streaming JoyAI-Video-Edit demo (ZeroGPU port of the reference deploy/ pipeline)

initial commit