重构后端，改为 node 技术栈

backend/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.11-slim
+FROM node:20-alpine
 
 WORKDIR /app
 
@@ -6,14 +6,15 @@ WORKDIR /app
 RUN mkdir -p /app/logs
 
 # Install dependencies
-COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+COPY package.json pnpm-lock.yaml ./
+RUN corepack enable pnpm && pnpm install --frozen-lockfile --prod
 
 # Copy application code
-COPY . .
+COPY src/ ./src/
+COPY .env ./
 
 # Expose port
 EXPOSE 8000
 
 # Run the application
-CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]
+CMD ["node", "src/app.js"]