Initial commit: backend scaffold, auth, frontend login

- FastAPI + SQLAlchemy async + Alembic + Postgres backend
- Auth: JWT access + rotating refresh tokens, argon2, roles, audit log
- React 19 + Vite frontend: login page, protected route, auth context
- Docker Compose: postgres, redis, migrate, api, worker (placeholder), frontend/nginx

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/main.tsx

@@ -0,0 +1,16 @@
+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+
+import { App } from '@/app/App'
+import '@/index.css'
+
+const rootElement = document.getElementById('root')
+if (!rootElement) {
+  throw new Error('Элемент #root не найден в index.html')
+}
+
+createRoot(rootElement).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)