fix: pre-download remote video URLs before render; use chrome-headless-shell if available

fix: correct hyperframes CLI — render <dir> -o <output>, PRODUCER_HEADLESS_SHELL_PATH for Chrome, workers=1 for cpu-basic

fix: run hyperframes from inside compDir with relative paths (cwd=compDir, ./index.html, -o ./render.mp4)

fix: correct HyperFrames CLI syntax — render takes file path + -o flag, not --width/--height args

fix: music URLs (use GitHub-hosted royalty-free MP3s, Pixabay CDN blocks server requests) + fix HyperFrames CLI path

feat: init Dee Video Studio — HyperFrames cloud render for testimonial/teaser/trailer videos