nginx: auch auf IPv6 lauschen, Healthcheck über 127.0.0.1

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WT5AWHW7UkHrBjhNyA2y8X

Dockerfile

@@ -4,4 +4,4 @@ COPY nginx.conf /etc/nginx/conf.d/default.conf
 COPY *.html /usr/share/nginx/html/
 COPY assets/ /usr/share/nginx/html/assets/
 EXPOSE 80
-HEALTHCHECK CMD wget -qO- http://localhost/ >/dev/null 2>&1 || exit 1
+HEALTHCHECK CMD wget -qO- http://127.0.0.1/ >/dev/null 2>&1 || exit 1