Add persistent multi-user sessions and Docker deployment

Dockerfile

@@ -0,0 +1,39 @@
+# syntax=docker/dockerfile:1
+
+FROM node:22-alpine AS frontend-build
+
+WORKDIR /build/frontend
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci
+COPY frontend/ ./
+RUN npm run build
+
+
+FROM python:3.14-slim AS runtime
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1
+
+WORKDIR /app
+
+RUN groupadd --gid 10001 app \
+    && useradd --uid 10001 --gid app --create-home --home-dir /home/app app \
+    && mkdir -p /app/config /app/data /app/frontend \
+    && chown -R app:app /app /home/app
+
+COPY requirements.txt ./
+RUN python -m pip install --no-cache-dir --requirement requirements.txt
+
+COPY --chown=app:app backend/ ./backend/
+COPY --from=frontend-build --chown=app:app /build/frontend/dist/ ./frontend/dist/
+
+USER app
+
+EXPOSE 8000
+VOLUME ["/app/data"]
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
+    CMD ["python", "-c", "import urllib.request; urllib.request.urlopen('http://127.0.0.1:8000/api/health/ready', timeout=4).close()"]
+
+CMD ["python", "-m", "uvicorn", "backend.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "1", "--timeout-graceful-shutdown", "180"]