Add production deployment

deployment/Dockerfile.backend

@@ -0,0 +1,19 @@
+FROM python:3.12 AS builder
+
+WORKDIR /app
+RUN python3 -m venv .venv
+COPY backend/requirements.txt .
+RUN ./.venv/bin/pip3 install -r requirements.txt
+
+FROM python:3.12-slim AS runtime
+
+WORKDIR /app
+RUN useradd -u 1000 app && \
+    chown -R app /app
+USER app
+
+COPY --chown=app backend .
+COPY --from=builder --chown=app /app/.venv .venv
+RUN mkdir -p /app/data
+
+ENTRYPOINT exec ./.venv/bin/fastapi run --port ${PORT:-8300} main.py