feat(deploy): add compose deployment

deploy/docker/backend/Dockerfile

@@ -0,0 +1,23 @@
+FROM python:3.14-slim AS runtime
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PYTHONPATH=/app/apps \
+    PLAYWRIGHT_BROWSERS_PATH=/ms-playwright \
+    PATH="/app/.venv/bin:${PATH}"
+
+WORKDIR /app
+
+RUN python -m pip install --no-cache-dir --upgrade pip uv
+
+COPY pyproject.toml uv.lock README.md ./
+COPY main.py ./main.py
+COPY apps ./apps
+
+RUN uv sync --frozen --no-dev --extra production \
+    && playwright install --with-deps chromium \
+    && mkdir -p /app/data /app/sessions /app/logs
+
+EXPOSE 8000
+
+CMD ["python", "main.py", "backend", "--host", "0.0.0.0", "--port", "8000", "--no-reload", "--log-level", "info"]