Update

Dockerfile

@@ -0,0 +1,20 @@
+# Stage 1: Frontend build
+FROM node:20-alpine AS frontend-build
+WORKDIR /app/frontend
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci
+COPY frontend/ ./
+RUN npm run build
+
+# Stage 2: Backend + Frontend
+FROM node:20-alpine AS runtime
+WORKDIR /app/backend
+COPY backend/package.json backend/package-lock.json ./
+RUN npm ci --only=production
+COPY backend/ ./
+COPY --from=frontend-build /app/frontend/dist ./public
+
+ENV NODE_ENV=production
+EXPOSE 4000
+USER node
+CMD ["node", "index.js"]