Add files via upload

backend/Dockerfile

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+# Use official Node.js LTS image
+FROM node:18
+
+# Set working directory
+WORKDIR /app
+
+# Copy package.json and package-lock.json
+COPY package.json package-lock.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy backend source files
+COPY . .
+
+# Expose port
+EXPOSE 5000
+
+# Start the server
+CMD ["node", "server.js"]