chore: Use build from source instead of pre-built images

docker-compose.prod.yml

@@ -18,7 +18,9 @@ services:
 
   # Backend API
   backend:
-    image: theluap/minio-webui-backend:latest
+    build:
+      context: ./backend
+      dockerfile: ../docker/Dockerfile.backend
     environment:
       - NODE_ENV=production
       - PORT=3000
@@ -63,7 +65,9 @@ services:
 
   # Frontend (nginx + React)
   frontend:
-    image: theluap/minio-webui-frontend:latest
+    build:
+      context: ./frontend
+      dockerfile: ../docker/Dockerfile.frontend
     depends_on:
       - backend
     restart: unless-stopped