Fix: Add missing dependencies (python-dateutil, APScheduler)

Fix: Task and subitem persistence issues

Fix userId consistency, add history service, fix task CRUD

Remove venv, add gitignore, update CORS

Add production CORS origins for Vercel

Add auto migration for new columns

Add full task fields: priority, status, due_date, category, tags, subitems

Fix requirements.txt formatting

Deploy FastAPI backend with MCP and OpenAI agents

initial commit