Restore full pre-tutorial Space snapshot (b0ebe11)

Restore pre-tutorial frontend from b0ebe11

Deploy tutorial feature and recent fixes

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

Replace MongoDB with SQLite + bucket-mounted file uploads

Workshop: persona/advisor experiments, builds, UI polish

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

Initial CU Student AI Project Helper: FastAPI, Gemini, Mongo, React SPA