Update API docs: document judge_language in all score endpoints

- POST /api/score: add judge_language section with default/usage

- POST /api/score/async: mention judge_language in docstring

- POST /api/score/session_async: add to description string + JSON example

- ScoreRequest / SessionScoreRequest: add judge_language to schema example

- request_summary snapshots: include judge_language for observability

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

webapp/services/session_score_manager.py

@@ -113,6 +113,7 @@ class SessionScoreJobManager:
                 "metrics": list(request.metrics),
                 "judge_model": request.judge_model or "",
                 "embedding_model": request.embedding_model or "",
+                "judge_language": request.judge_language or "",
                 "has_contexts": bool(request.contexts),
                 "has_ground_truth": bool(request.ground_truth),
                 "session_id": session_id,