Add SetupPage, LoginPage, DashboardPage, ProjectsPage, ExperimentPage, LivePage,
ComparePage, and AdminPage as placeholder components. Wire up react-router-dom routing
in App.tsx with BrowserRouter in main.tsx. Unknown routes redirect to dashboard.
Install vitest + @testing-library/react and add 9 routing tests. Build passes cleanly.
Three-stage Dockerfile: frontend-build (Node 20), api (Python 3.12 + uvicorn),
web (nginx 1.27). nginx.conf proxies /api and /ws to the API service with
WebSocket upgrade support. Includes backend/requirements.txt with all Python
deps, frontend scaffolding (Vite + React + TypeScript + Tailwind), and
placeholder alembic files for Docker COPY compatibility.
