replace nginx with existing traefik, split networks.

frontend/Dockerfile

@@ -7,7 +7,7 @@ WORKDIR /app
 COPY package*.json ./
 
 # Install dependencies
-RUN npm ci
+RUN npm install
 
 # Copy source code
 COPY . .
@@ -25,7 +25,7 @@ EXPOSE 3000
 
 # Health check
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
-  CMD curl -f http://localhost:3000 || exit 1
+  CMD wget --no-verbose --tries=1 --spider http://localhost:3000 || exit 1
 
 # Start the application
 CMD ["npm", "start"]