chore: revert docker-compose to GHCR registry

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

docker-compose.yml

@@ -1,9 +1,6 @@
 services:
   backend:
-    image: bigbodycobain/shadowbroker-backend:latest
-    build:
-      context: .
-      dockerfile: backend/Dockerfile
+    image: ghcr.io/bigbodycobain/shadowbroker-backend:latest
     container_name: shadowbroker-backend
     ports:
       - "${BIND:-127.0.0.1}:8000:8000"
@@ -36,9 +33,7 @@ services:
           cpus: '2'
 
   frontend:
-    image: bigbodycobain/shadowbroker-frontend:latest
-    build:
-      context: ./frontend
+    image: ghcr.io/bigbodycobain/shadowbroker-frontend:latest
     container_name: shadowbroker-frontend
     ports:
       - "${BIND:-127.0.0.1}:3000:3000"