fix(scribus): add healthcheck override for scribus-novnc

The Dockerfile's healthcheck hit a nonexistent /health endpoint, causing
permanent "unhealthy" status. Override with a check that accepts any HTTP
response (including 401) as proof the service is running.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -334,6 +334,12 @@ services:
       - SCREEN_WIDTH=1920
       - SCREEN_HEIGHT=1080
       - SCREEN_DEPTH=24
+    healthcheck:
+      test: ["CMD-SHELL", "curl -so /dev/null -w '%{http_code}' http://localhost:8765/ | grep -q '^[2-4]'"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 30s
     labels:
       - "traefik.enable=true"
       - "traefik.http.routers.scribus-novnc.rule=Host(`design.rspace.online`)"