Initial commit: RSVP Manager with React frontend and Express backend

Dockerfile

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+FROM node:18-alpine
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+COPY frontend/package*.json ./frontend/
+
+# Install dependencies
+RUN npm install
+RUN cd frontend && npm install
+
+# Copy source files
+COPY . .
+
+# Build frontend
+RUN cd frontend && npm run build
+
+# Expose port
+EXPOSE 3000
+
+# Start the application
+CMD ["npm", "start"]