fix: update Docker image name to match erp-mafia org

Repo moved from gnubok/gnubok to erp-mafia/erp-base. Updated GHCR image
reference in CI workflow and docker-compose.

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

.github/workflows/docker-publish.yml

@@ -6,7 +6,7 @@ on:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: gnubok/gnubok
+  IMAGE_NAME: erp-mafia/erp-base
 
 jobs:
   build-and-push:

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   app:
-    image: ghcr.io/gnubok/gnubok:latest
+    image: ghcr.io/erp-mafia/erp-base:latest
     env_file: .env
     ports:
       - "${PORT:-3000}:3000"