Add judge_language config plumbing (settings + scenario + ScoreRequest)

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

webapp/models.py

@@ -48,6 +48,15 @@ class DistributionBin(BaseModel):
     count: int
 
 
+class SampleHistoryEntry(BaseModel):
+    """One past evaluation of the same question, for the history comparison table."""
+
+    run_id: str
+    scenario_name: str = ""
+    finished_at: str = ""
+    metrics: dict[str, float | None] = Field(default_factory=dict)
+
+
 class SampleScore(BaseModel):
     """Per-sample row used for the lowest-score review table."""
 
@@ -62,6 +71,10 @@ class SampleScore(BaseModel):
     metrics: dict[str, float | None] = Field(default_factory=dict)
     mean_score: float | None = None
     error: str = ""
+    history: list[SampleHistoryEntry] = Field(
+        default_factory=list,
+        description="同一问题在以往运行中的评分（按时间倒序），用于历史对比。",
+    )
 
 
 class ReportData(BaseModel):
@@ -460,6 +473,10 @@ class ScoreRequest(BaseModel):
         default=None,
         description="Embedding 模型名称；为 null 时使用 .env 中的 RAGAS_EMBEDDING_MODEL。",
     )
+    judge_language: str | None = Field(
+        default=None,
+        description="评判 prompt 语言；'zh' 启用中文评判，为 null 时使用 RAGAS_JUDGE_LANGUAGE（默认 en）。",
+    )
 
     @field_validator("metrics")
     @classmethod