Fix healthcheck to use 127.0.0.1 instead of localhost

Alpine Linux doesn't resolve localhost properly in some cases

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -18,7 +18,7 @@ services:
     networks:
       - traefik-public
     healthcheck:
-      test: ["CMD", "wget", "-q", "--spider", "http://localhost:3000"]
+      test: ["CMD", "wget", "-q", "--spider", "http://127.0.0.1:3000"]
       interval: 30s
       timeout: 10s
       retries: 3