Revert "Switch judge evaluator from GPT-4o to Claude to avoid OpenAI quota limits"

This reverts commit df66e38.

Author: sattensil

.github/workflows/ai-config-validation.yml

@@ -294,8 +294,6 @@ jobs:
             --api-url http://localhost:8000 \
             --endpoint /chat \
             --minimal-payload \
-            --judge-model claude-3-5-sonnet-20241022 \
-            --judge-provider anthropic \
             --report test-report.json
 
           TEST_EXIT_CODE=$?