fix: 代码审查问题修复

- unit_of_work.py: 简化为纯 session 上下文管理器,消除 double-close 风险
- validation.py: 移除未使用的 import,简化 _score_to_1x2 逻辑
- repositories.py: 将 func 导入移到模块顶层
- 更新所有 get_uow() 调用点使用新接口(yield session 而非 uow 对象)

src/api/routes/ingest.py

@@ -16,15 +16,14 @@ async def ingest_bzzoiro_route(req: IngestBzzoiroRequest):
     """触发 bzzoiro 采集。"""
     source = get_source("bzzoiro")
     try:
-        async with get_uow() as uow:
+        async with get_uow() as session:
             result = await source.ingest(
-                uow.session,
+                session,
                 leagues=req.leagues,
                 date_from=req.date_from,
                 date_to=req.date_to,
                 status=req.status,
             )
-            await uow.commit()
         return IngestResponse(**result)
     except Exception as e:
         raise HTTPException(500, str(e))
@@ -35,9 +34,8 @@ async def ingest_understat_route(req: IngestUnderstatRequest):
     """触发 understat xG 回填。"""
     source = get_source("understat")
     try:
-        async with get_uow() as uow:
-            result = await source.ingest(uow.session, league=req.league, season=req.season)
-            await uow.commit()
+        async with get_uow() as session:
+            result = await source.ingest(session, league=req.league, season=req.season)
         return IngestSimpleResponse(**result)
     except Exception as e:
         raise HTTPException(500, str(e))
@@ -47,9 +45,8 @@ async def ingest_understat_route(req: IngestUnderstatRequest):
 async def ingest_injuries_route(req: IngestInjuriesRequest):
     """触发伤停采集。"""
     try:
-        async with get_uow() as uow:
-            result = await ingest_injuries(uow.session, date=req.date)
-            await uow.commit()
+        async with get_uow() as session:
+            result = await ingest_injuries(session, date=req.date)
         return IngestSimpleResponse(**result)
     except Exception as e:
         raise HTTPException(500, str(e))