Update Dockerfile

Dockerfile

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+# Base image
+FROM node:18-slim
+
+# Set work directory
+WORKDIR /app
+
+# Copy package.json and install dependencies
+COPY package.json ./
+RUN npm install --production
+
+# Copy source code
+COPY . .
+
+# Expose port (Hugging Face expects 7860 by default, but you can use 3000)
+EXPOSE 3000
+
+# Start app
+CMD ["node", "index.js"]