support pinning HF model revision via DOTS_TTS_MODEL_REVISION env var

bump default num_steps to 16

switch default execution mode to generate

add voice cloning tips card to UI

add constraint on both prompt text and text to generate

update constraints for better performance

add some constraints for better performance

copy from /tmp to persist bucket to avoid gradio error

refine Gradio placeholder translation

change generated dir to huggingface space mounted bucket

add inference code with AOTI support for hf space