reposition extra GPU reservation slider to be directly below generate video button

add extra GPU reservation buffer slider 0-10s and unique guest IP identification

add persistent CPU LoRA cache dropdown selector for instant re-use without redownload

rename template to sulphur_silver.html and translate UI helper texts to English

refactor UI into 2 sub-tabs for Sulphur & VIP RIFE, and set video merge to manual mode

fix BLIP describe image return statement in prompt_enhancer.py

refactor ui.py into modular ui_modules package for high maintainability