refact: use only server

frontend/Dockerfile

@@ -1,12 +1,21 @@
-FROM node:18-alpine
+FROM node:20-slim
 
 WORKDIR /app
 
-COPY package.json ./
-RUN npm install
+# Install curl for health checks
+RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
 
+# Install dependencies for better caching
+COPY package.json package-lock.json* ./
+RUN npm ci || npm install
+
+# Copy source code
 COPY . .
 
+# Build the application for production
+RUN npm run build
+
 EXPOSE 3000
 
-CMD ["npm", "run", "dev", "--", "--host", "0.0.0.0"]
+# For production, serve the built files
+CMD ["npm", "run", "preview", "--", "--host", "0.0.0.0", "--port", "3000"]