add docker files

backend/.dockerignore

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+node_modules
+uploads
+.git
+.dockerignore
+Dockerfile
+.env

backend/Dockerfile

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+# Use the official Node.js 23.10 image
+FROM node:23.10
+
+# Set working directory inside the container
+WORKDIR /app
+
+# Copy only package.json and lock file first for caching
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy the rest of the app (after installing dependencies for cache efficiency)
+COPY . .
+
+# Expose the port your server listens on (adjust if needed)
+EXPOSE 8005
+
+# Start the app
+CMD ["node", "server.js"]