feat: integrate Supertonic-3 TTS support

Prewarm Kokoro on startup and force Kokoro voice list visibility

Fix Kokoro UI voice controls and normalize supported language codes

Fix Kokoro voice selection when switching from Edge provider

Use official kokoro-onnx release files to fix voices loading

Fix Kokoro voices path resolution for ONNX repo layout

Remove Piper provider and keep Edge + Kokoro setup

Remove Developer Toolkit section from UI

Fix voice filter UX and show request URL/body in output panel

Remove banner caption and expand all dropdown options

Improve hero banner and add brand DNA overlay

Track image assets with Git LFS for HF Spaces

Fix Space metadata validation

Deploy EG Autonomous TTS Studio app

initial commit