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>

backend/app/config.py

@@ -0,0 +1,22 @@
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    DATABASE_URL: str = "postgresql+asyncpg://ai_assistant:changeme@postgres:5432/ai_assistant"
+    SECRET_KEY: str = "changeme_secret_key_at_least_32_chars_long"
+    ENVIRONMENT: str = "development"
+
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 15
+    REFRESH_TOKEN_EXPIRE_DAYS: int = 30
+    REFRESH_TOKEN_EXPIRE_HOURS: int = 24
+
+    BACKEND_CORS_ORIGINS: list[str] = ["http://localhost", "http://localhost:3000"]
+
+    FIRST_ADMIN_EMAIL: str = "admin@example.com"
+    FIRST_ADMIN_USERNAME: str = "admin"
+    FIRST_ADMIN_PASSWORD: str = "changeme_admin_password"
+
+    model_config = {"env_file": ".env", "extra": "ignore"}
+
+
+settings = Settings()