Fix Swarm health checks by using 127.0.0.1 instead of localhost

Health checks using 'localhost' fail in Docker Swarm overlay network
due to DNS resolution issues in the container's network namespace.

Using the IP address 127.0.0.1 directly bypasses DNS and works
correctly. Tested on both blog and wallet containers in Swarm mode.

This re-enables health checks that were disabled in the previous commit,
restoring proper container health monitoring for rolling updates.