fase(22): docker production setup

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/Dockerfile

@@ -10,11 +10,17 @@ COPY . .
 RUN npm run build
 
 # ---- Production stage ----
-FROM nginx:alpine
+FROM nginx:1.27-alpine
+
+# Remove default nginx config
+RUN rm /etc/nginx/conf.d/default.conf
 
 COPY --from=builder /app/dist /usr/share/nginx/html
 COPY nginx.conf /etc/nginx/conf.d/default.conf
 
 EXPOSE 80
 
+HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
+  CMD wget -qO- http://localhost:80/ || exit 1
+
 CMD ["nginx", "-g", "daemon off;"]