feat: add health check endpoint and Docker health monitoring

Add a /health endpoint to the application controller and configure Docker health checks.
This enables container orchestration systems to monitor the application's liveness and readiness.

Dockerfile

@@ -18,4 +18,7 @@ RUN npm run build
 
 EXPOSE 3000
 
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/health || exit 1
+
 CMD ["npm", "start"]