add sub endpoints

fix pgmusic with ffmgep

optmaize spead

add emproved proccess parameter

Include bgmusic in list-saved endpoint

Add Cinematic Blur layout and fix clear endpoint

Add FFmpeg optimizations and hybrid processing

Optimize audio extraction using FFmpeg directly for faster processing

Upload complete video processing API with audio extraction

Add video processing optimizations: Parallel processing for multiple clips (20-40% faster), reuse video instance, tune=zerolatency, CRF optimization, and use_parallel parameter

Add FastAPI video processing app