Phase 1: Foundation — backend auth, frontend shell, Docker setup

Backend (FastAPI):
- App factory with async SQLAlchemy 2.0 + PostgreSQL
- Alembic migration for users and sessions tables
- JWT auth (access + refresh tokens, bcrypt passwords)
- Auth endpoints: register, login, refresh, logout, me
- Admin seed script, role-based access deps

Frontend (React + TypeScript):
- Vite + Tailwind CSS + shadcn/ui theme (health-oriented palette)
- i18n with English and Russian translations
- Zustand auth/UI stores with localStorage persistence
- Axios client with automatic token refresh on 401
- Login/register pages, protected routing
- App layout: collapsible sidebar, header with theme/language toggles
- Dashboard with placeholder stats

Infrastructure:
- Docker Compose (postgres, backend, frontend, nginx)
- Nginx reverse proxy with WebSocket support
- Dev override with hot reload

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.env.example

@@ -0,0 +1,20 @@
+# PostgreSQL
+POSTGRES_USER=ai_assistant
+POSTGRES_PASSWORD=changeme_db_password
+POSTGRES_DB=ai_assistant
+
+# Backend
+DATABASE_URL=postgresql+asyncpg://ai_assistant:changeme_db_password@postgres:5432/ai_assistant
+SECRET_KEY=changeme_secret_key_at_least_32_chars_long
+BACKEND_CORS_ORIGINS=["http://localhost","http://localhost:3000"]
+ENVIRONMENT=development
+
+# Auth
+ACCESS_TOKEN_EXPIRE_MINUTES=15
+REFRESH_TOKEN_EXPIRE_DAYS=30
+REFRESH_TOKEN_EXPIRE_HOURS=24
+
+# Admin seed
+FIRST_ADMIN_EMAIL=admin@example.com
+FIRST_ADMIN_USERNAME=admin
+FIRST_ADMIN_PASSWORD=changeme_admin_password