Fix interactive chat wizards and surface in-progress creations on workshop pages.

Switch all LLM calls to GPT-5.4 and load secrets from shared.env.

Workshop UI, speech settings, experiment page, and HF Spaces deployment

Replace single-image compose with hot-reload compose as default; remove docker-compose.dev.yml

Add docker-compose.dev.yml hot reload (Mongo, uvicorn --reload, Vite); SERVE_FRONTEND_STATIC; API_PROXY_TARGET