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>

frontend/public/locales/en/translation.json

@@ -0,0 +1,57 @@
+{
+  "auth": {
+    "login": "Log In",
+    "register": "Sign Up",
+    "email": "Email",
+    "password": "Password",
+    "confirmPassword": "Confirm Password",
+    "username": "Username",
+    "fullName": "Full Name",
+    "rememberMe": "Remember me",
+    "submit": "Submit",
+    "noAccount": "Don't have an account?",
+    "hasAccount": "Already have an account?",
+    "loginTitle": "Welcome Back",
+    "loginSubtitle": "Sign in to your account",
+    "registerTitle": "Create Account",
+    "registerSubtitle": "Get started with your personal AI assistant",
+    "errors": {
+      "invalidCredentials": "Invalid email or password",
+      "emailExists": "User with this email or username already exists",
+      "passwordMismatch": "Passwords do not match",
+      "passwordMinLength": "Password must be at least 8 characters",
+      "usernameFormat": "Username must be 3-50 characters (letters, numbers, _ or -)",
+      "required": "This field is required"
+    }
+  },
+  "layout": {
+    "dashboard": "Dashboard",
+    "chats": "Chats",
+    "documents": "Documents",
+    "memory": "Memory",
+    "notifications": "Notifications",
+    "profile": "Profile",
+    "logout": "Log Out",
+    "settings": "Settings",
+    "admin": "Admin",
+    "users": "Users",
+    "context": "Context",
+    "skills": "Skills"
+  },
+  "dashboard": {
+    "welcome": "Welcome, {{name}}",
+    "subtitle": "Your personal AI health assistant"
+  },
+  "common": {
+    "loading": "Loading...",
+    "error": "An error occurred",
+    "notFound": "Page not found",
+    "goHome": "Go to Dashboard",
+    "save": "Save",
+    "cancel": "Cancel",
+    "delete": "Delete",
+    "edit": "Edit",
+    "create": "Create",
+    "search": "Search"
+  }
+}

frontend/public/locales/ru/translation.json

@@ -0,0 +1,57 @@
+{
+  "auth": {
+    "login": "Войти",
+    "register": "Регистрация",
+    "email": "Email",
+    "password": "Пароль",
+    "confirmPassword": "Подтвердите пароль",
+    "username": "Имя пользователя",
+    "fullName": "Полное имя",
+    "rememberMe": "Запомнить меня",
+    "submit": "Отправить",
+    "noAccount": "Нет аккаунта?",
+    "hasAccount": "Уже есть аккаунт?",
+    "loginTitle": "С возвращением",
+    "loginSubtitle": "Войдите в свой аккаунт",
+    "registerTitle": "Создать аккаунт",
+    "registerSubtitle": "Начните работу с персональным ИИ-ассистентом",
+    "errors": {
+      "invalidCredentials": "Неверный email или пароль",
+      "emailExists": "Пользователь с таким email или именем уже существует",
+      "passwordMismatch": "Пароли не совпадают",
+      "passwordMinLength": "Пароль должен содержать минимум 8 символов",
+      "usernameFormat": "Имя пользователя: 3-50 символов (буквы, цифры, _ или -)",
+      "required": "Это поле обязательно"
+    }
+  },
+  "layout": {
+    "dashboard": "Главная",
+    "chats": "Чаты",
+    "documents": "Документы",
+    "memory": "Память",
+    "notifications": "Уведомления",
+    "profile": "Профиль",
+    "logout": "Выйти",
+    "settings": "Настройки",
+    "admin": "Администрирование",
+    "users": "Пользователи",
+    "context": "Контекст",
+    "skills": "Навыки"
+  },
+  "dashboard": {
+    "welcome": "Добро пожаловать, {{name}}",
+    "subtitle": "Ваш персональный ИИ-ассистент по здоровью"
+  },
+  "common": {
+    "loading": "Загрузка...",
+    "error": "Произошла ошибка",
+    "notFound": "Страница не найдена",
+    "goHome": "На главную",
+    "save": "Сохранить",
+    "cancel": "Отмена",
+    "delete": "Удалить",
+    "edit": "Редактировать",
+    "create": "Создать",
+    "search": "Поиск"
+  }
+}