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>

backend/Dockerfile

@@ -0,0 +1,34 @@
+# syntax=docker/dockerfile:1
+
+FROM python:3.12-slim AS base
+
+ENV PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1
+
+WORKDIR /app
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Зависимости ставятся отдельным слоем от кода: правка исходников
+# не должна приводить к переустановке пакетов.
+COPY pyproject.toml ./
+RUN pip install --no-cache-dir "setuptools>=75" && pip install --no-cache-dir .
+
+COPY alembic.ini ./
+COPY alembic ./alembic
+COPY app ./app
+
+# Процесс не должен работать от root.
+RUN useradd --create-home --uid 1000 appuser && chown -R appuser:appuser /app
+USER appuser
+
+EXPOSE 8000
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
+    CMD curl -fsS http://127.0.0.1:8000/api/v1/health || exit 1
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]