feat(web): info icon on every param with hover/click tooltip; add help text to all params

feat(models): expand chatterbox-turbo params (seed, top_k, exaggeration, cfg_weight, etc.)

feat(api): adapter generate returns seed_used; expose X-Seed-Used header

fix: re-encode reference voices as PCM WAV in browser; expand turbo tag list to 9

feat(models): chatterbox-turbo and chatterbox-mtl adapters