修改

backend/Dockerfile

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+FROM python:3.11-slim
+WORKDIR /app
+
+# system deps (if any) can be added here
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY backend/requirements.txt ./requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY backend/ ./
+
+ENV PYTHONUNBUFFERED=1
+EXPOSE 18080
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "18080", "--proxy-headers"]