Add healthcheck to Authelia (authelia helper health-check)

Authelia ships its own health-check binary subcommand since 4.37+.
Avoids needing wget/curl in the container.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

security/authelia/docker-compose.yml

@@ -26,6 +26,12 @@ services:
       - backend_net
     security_opt:
       - no-new-privileges:true
+    healthcheck:
+      test: ["CMD", "authelia", "helper", "health-check"]
+      interval: 30s
+      timeout: 5s
+      retries: 5
+      start_period: 30s
     labels:
       - "traefik.enable=true"
       - "traefik.docker.network=frontend_net"