config: set default judge_model=gpt-5, embedding_model=text-embedding-3-small

gpt-5.4/5.5/5.2/5.4-mini/5.4-nano are incompatible with RAGAS 0.4.3
because they require max_completion_tokens instead of max_tokens.
gpt-5 / gpt-4.1 support max_tokens and json_object mode required by RAGAS.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

webapp/models.py

@@ -420,7 +420,7 @@ class ScoreRequest(BaseModel):
                     "context_recall",
                     "context_precision",
                 ],
-                "judge_model": "gpt-5.4",
+                "judge_model": "gpt-5",
                 "embedding_model": "text-embedding-3-small",
             }
         }