feat: async score jobs — POST /api/score/async + 评分记录 page

Each async score job:
- Runs InlineScorer.score() in thread pool
- Writes standard run artifacts (metadata.json, scores.csv, summary.md)
- Runs optimization_advisor => optimization_advice.md
- Result appears in 运行列表 and 报告详情 with full report

New endpoints:
- POST /api/score/async  (202, job_id immediate)
- GET  /api/score/jobs   (list all jobs)
- GET  /api/score/jobs/{id} (single job status)

Frontend:
- 评分记录 nav page with card list
- 5s auto-polling for queued/running jobs
- 查看报告 button navigates to existing 报告详情 page

Dify: change /api/score -> /api/score/async, no response parsing needed

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

webapp/server.py

@@ -17,7 +17,7 @@ from fastapi.exceptions import RequestValidationError
 from fastapi.responses import FileResponse, JSONResponse
 from fastapi.staticfiles import StaticFiles
 
-from webapp.api import evaluations, llm_profiles, pipeline, runs, scenarios, score
+from webapp.api import evaluations, llm_profiles, pipeline, runs, scenarios, score, score_jobs
 
 STATIC_DIR = Path(__file__).resolve().parent / "static"
 logger = logging.getLogger("webapp.server")
@@ -69,10 +69,12 @@ OPENAPI_TAGS = [
     {
         "name": "score",
         "description": (
-            "**实时评分 API（Dify 外部 Tool）**\n\n"
-            "接受单条问答记录 `(question, answer, contexts, ground_truth)`，\n"
-            "同步运行 RAGAS 指标打分，返回各指标得分和加权综合得分。\n\n"
-            "适用场景：Dify Agent 在回答后即时调用，用于质量监控或自我改进。\n\n"
+            "**实时评分 API（同步）** — `POST /api/score`\n\n"
+            "**异步评分 API（Dify 推荐）** — `POST /api/score/async`\n\n"
+            "异步方式立即返回 job_id（202），评分在后台执行，完成后自动生成完整报告（含优化建议），"
+            "在「运行列表」页查看。\n\n"
+            "通过 `GET /api/score/jobs` 列出所有异步评分记录，"
+            "`GET /api/score/jobs/{job_id}` 查询单个任务状态。\n\n"
             "**鉴权**：若 `.env` 中配置了 `SCORE_API_TOKEN`，需携带 "
             "`Authorization: Bearer <token>` 请求头。"
         ),
@@ -108,6 +110,7 @@ def create_app() -> FastAPI:
     app.include_router(llm_profiles.router)
     app.include_router(pipeline.router)
     app.include_router(score.router)
+    app.include_router(score_jobs.router)
 
     @app.middleware("http")
     async def access_log_middleware(request: Request, call_next):