Deploy tutorial feature and recent fixes

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.

Replace MongoDB with SQLite + bucket-mounted file uploads

feat(experiment): multi-LLM chat with LLMChats3-style registry

Add RAG document upload and context injection for personas and advisor panels

Workshop: persona/advisor experiments, builds, UI polish

feat: advisor panel wizard, persona selection, and workshop updates

feat(persona): v2 wizard fields, chat draft sync, UX polish

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

Fix Gemini chat (retries, JSON parse, config path), health gemini flag; always-visible user menu; Profile for guests; clearer chat errors

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