refactor(ai-service): rebrand test_docker.ps1 cleanup third docker tag (gpu-test) from soter to chainforge

Author: kilodesodiq-arch

app/ai-service/test_docker.ps1

@@ -252,7 +252,7 @@ function Invoke-Cleanup {
     docker-compose down 2>$null
 
     # Remove test images
-    docker rmi chainforge-ai-service:test chainforge-ai-service:dev-test soter-ai-service:gpu-test 2>$null
+    docker rmi chainforge-ai-service:test chainforge-ai-service:dev-test chainforge-ai-service:gpu-test 2>$null
 
     Write-Status "Cleanup completed ✓"
 }