feat: Phase 4 — Experiment 自动归档 + 异步 Job（状态机 / SSE / 一键复跑）

- 数据表：job / experiment（spec/result JSON 存档、code_version），Alembic 迁移 53113c80257f
- Job：queued→running→(success|failed) 状态机，BackgroundTasks 本地执行 + 失败兜底标记；结果与 Experiment 关联
- Experiment：每次研究成功自动归档（含 git commit 与收益摘要），支持一键复跑（同 spec 重建 Job）
- API：POST /api/jobs、GET /api/jobs/{id}（内嵌结果）、SSE /api/jobs/{id}/events、/api/experiments 列表/详情/rerun
- 前端：新增「实验」页（列表 / 详情 / 复跑 + Job 轮询）；导航更新
- 端到端验证：真实 20 股 job 提交→后台执行→success→EXP 归档（-12.41%）；executor 成功/失败路径单测
- 测试 73 passed（新增 5 项 Job/Experiment）/ ruff clean / 前端 tsc + build 通过

backend/app/api/deps.py

@@ -10,6 +10,7 @@ from typing import Annotated
 from fastapi import Depends
 from sqlalchemy.orm import Session
 
+from app.domain.repositories.jobs import ExperimentRepository, JobRepository
 from app.domain.repositories.market import (
     DailyBarRepository,
     StockRepository,
@@ -49,3 +50,23 @@ StockRepoDep = Annotated[StockRepository, Depends(_stock_repo_factory)]
 DailyRepoDep = Annotated[DailyBarRepository, Depends(_daily_repo_factory)]
 EngineDep = Annotated[QuantEngine, Depends(_engine_factory)]
 ResearchServiceDep = Annotated[ResearchService, Depends(_service_factory)]
+
+
+def _job_repo_factory(session: DbSession):
+    from app.infrastructure.persistence.sqlalchemy.repositories.jobs_impl import (
+        SqlAlchemyJobRepository,
+    )
+
+    return SqlAlchemyJobRepository(session)
+
+
+def _experiment_repo_factory(session: DbSession):
+    from app.infrastructure.persistence.sqlalchemy.repositories.jobs_impl import (
+        SqlAlchemyExperimentRepository,
+    )
+
+    return SqlAlchemyExperimentRepository(session)
+
+
+JobRepoDep = Annotated[JobRepository, Depends(_job_repo_factory)]
+ExperimentRepoDep = Annotated[ExperimentRepository, Depends(_experiment_repo_factory)]