chore: prod compose back to GHCR image (publish workflow fixed)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docker-compose.prod.yml

@@ -1,10 +1,6 @@
 services:
   xtremflow:
-    # Build direct depuis GitHub (l'image GHCR sera utilisée quand le
-    # workflow Docker Publish sera réparé : image: ghcr.io/r0m1k3/xtremflow:latest)
-    build:
-      context: https://github.com/R0m1k3/xtremflow.git
-      dockerfile: Dockerfile
+    image: ghcr.io/r0m1k3/xtremflow:latest
     container_name: xtremflow
     ports:
       - "8089:8089"