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/api/session_score_jobs.py

@@ -54,7 +54,8 @@ logger = logging.getLogger("webapp.api.session_score_jobs")
         "- `contexts`：检索片段拼接字符串，按 `context_separator` 拆分。\n"
         "- `ground_truth`：标准答案，可选；缺失时会自动跳过依赖它的指标。\n"
         "- `metrics`：本次需要计算的指标列表。\n"
-        "- `judge_model` / `embedding_model`：可选；为空时回退到系统默认配置。\n\n"
+        "- `judge_model` / `embedding_model`：可选；为空时回退到系统默认配置。\n"
+        "- `judge_language`：评判 prompt 语言，`\"zh\"` 开启中文评判，默认 `null`（全局配置，出厂为 `\"en\"`）。\n\n"
         "**处理行为**\n"
         "1. 服务端立即返回 `202 Accepted`，并生成本次调用的 `job_id`。\n"
         "2. 系统根据 `session_id` 计算固定 `run_id`，格式为 `session-<sanitized-session_id>`。\n"
@@ -75,7 +76,8 @@ logger = logging.getLogger("webapp.api.session_score_jobs")
         "  \"context_separator\": \" |||| \",\n"
         "  \"metrics\": [\"answer_relevancy\", \"faithfulness\"],\n"
         "  \"judge_model\": \"gpt-5.5\",\n"
-        "  \"embedding_model\": \"text-embedding-3-small\"\n"
+        "  \"embedding_model\": \"text-embedding-3-small\",\n"
+        "  \"judge_language\": \"zh\"\n"
         "}\n"
         "```"
     ),
@@ -113,6 +115,8 @@ def submit_session_async_score(request: SessionScoreRequest) -> SessionScoreJobR
 
     **适合 Dify 工作流**：在循环节点中批量调用，所有轮次共用同一 `session_id`，
     最终在 RAGAS 平台「运行列表」中查看完整的批量评估报告。
+
+    **`judge_language`**：传 `"zh"` 开启中文评判 prompt；默认 `null`（使用全局配置，出厂为 `"en"`）。
     """
     logger.info(
         "[session_async] submit  session_id=%s  metrics=%s  has_ctx=%s  has_gt=%s",