Add complete dockerized amigos app with React frontend and MongoDB backend

Dockerfile

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+# Build stage for React app
+FROM node:18-alpine AS frontend-build
+
+WORKDIR /app
+
+# Copy frontend package files
+COPY package*.json ./
+RUN npm ci
+
+# Copy frontend source
+COPY index.html vite.config.js ./
+COPY src ./src
+
+# Build React app
+RUN npm run build
+
+# Production stage
+FROM node:18-alpine
+
+WORKDIR /app
+
+# Copy backend files
+COPY backend/package*.json ./backend/
+WORKDIR /app/backend
+RUN npm ci --only=production
+
+# Copy backend source files
+COPY backend/server-prod.js ./
+
+# Copy built React app from build stage
+COPY --from=frontend-build /app/dist /app/dist
+
+# Go back to app directory
+WORKDIR /app
+
+# Expose port
+EXPOSE 3001
+
+# Start the backend server
+CMD ["node", "backend/server-prod.js"]