refactor: 以 bzzoiro 为唯一数据源的全面重构

数据源统一为 bzzoiro,移除 Understat 与 injuries:
- 删除 src/data/understat.py / injuries.py 及相关测试
- 删除 injuries 模型与表;扩展 match_stats(xG 之外增加 big_chances/fouls)
- 新增 standings 表(联赛积分榜:位置/积分/xG/走势/分区)
- matches 表增加 source_event_id 血缘列,支撑统计回填

采集管线(bzzoiro 三条管线):
- events:赛程/比分(/events/),记录 source_event_id
- standings:积分榜快照(/leagues/{id}/standings/)
- stats:已完赛比赛详细统计回填(/events/{id}/stats/)

预测增强:
- standings_slice 替代 injuries_slice;积分榜专家替代阵容完整性专家
- AGENT_META runtime_config 同步更新

管理后台:
- ingest 路由重写为单一 bzzoiro 入口 + task 参数(events/standings/stats/all)
- 新增 /admin/data-completeness 数据完整性分析 API
- 数据源状态页简化为 bzzoiro 单源

前端:
- 采集页重构为任务驱动(比赛/积分榜/统计回填/全量)
- 新增「数据完整性」可视化页(覆盖率矩阵/字段完整率/健康摘要)
- 新增主站积分榜页(/standings)与比赛详情完整统计面板
- agent 名称同步更新(injuries→standings)

迁移 0015_bzzoiro_single_source 已在容器内验证通过,后端测试全部通过。

Co-Authored-By: new-provider/LongCat-2.0 <<EMAIL>>

src/api/routes/matches.py

@@ -10,11 +10,28 @@ from sqlalchemy.orm import selectinload
 from src.api.deps import require_admin
 from src.api.schemas import MatchListOut, MatchOut, PredictionOut
 from src.db.base import AsyncSession, get_db_read
-from src.db.models import League, Match, Prediction
+from src.db.models import League, Match, Prediction, Standing
 
 router = APIRouter(prefix="/api/v1", tags=["data"])
 
 
+def _stats_dict(stats) -> dict | None:
+    """把 MatchStats ORM 对象序列化为前端可读的扁平 dict。"""
+    if stats is None:
+        return None
+    return {
+        "home_xg": stats.home_xg, "away_xg": stats.away_xg,
+        "home_shots": stats.home_shots, "away_shots": stats.away_shots,
+        "home_shots_on_target": stats.home_shots_on_target, "away_shots_on_target": stats.away_shots_on_target,
+        "home_corners": stats.home_corners, "away_corners": stats.away_corners,
+        "home_possession": stats.home_possession,
+        "home_yellow_cards": stats.home_yellow_cards, "away_yellow_cards": stats.away_yellow_cards,
+        "home_red_cards": stats.home_red_cards, "away_red_cards": stats.away_red_cards,
+        "home_big_chances": stats.home_big_chances, "away_big_chances": stats.away_big_chances,
+        "home_fouls": stats.home_fouls, "away_fouls": stats.away_fouls,
+    }
+
+
 @router.get("/leagues", response_model=list[dict], dependencies=[Depends(require_admin)])
 async def list_leagues(db: AsyncSession = Depends(get_db_read)):
     stmt = select(League).order_by(League.name)
@@ -155,6 +172,7 @@ async def get_match(match_id: int, db: AsyncSession = Depends(get_db_read)):
         match_stage=m.match_stage,
         home_xg=m.stats.home_xg if m.stats else None,
         away_xg=m.stats.away_xg if m.stats else None,
+        stats=_stats_dict(m.stats) if m.stats else None,
         recent_predictions=[
             PredictionOut(
                 id=p.id, match_id=p.match_id, provider=p.provider, model=p.model,
@@ -246,3 +264,81 @@ async def match_context(match_id: int, db: AsyncSession = Depends(get_db_read)):
         "away_recent": [_row_to_dict(r) for r in away_recent],
         "h2h": [_row_to_dict(r) for r in h2h],
     }
+
+
+@router.get("/standings")
+async def list_standings(
+    league: str | None = Query(None, description="联赛代码,如 E0;空 = 全部联赛"),
+    season: str | None = Query(None, description="赛季标签,如 2026-2027;空 = 各联赛最新赛季"),
+    db: AsyncSession = Depends(get_db_read),
+):
+    """联赛积分榜(只读)。按联赛分组,每张榜按 position 排序。
+
+    season 为空时返回每个联赛最新采集到的赛季榜单(适合前端"查看最新积分榜")。
+    """
+    # 取每个联赛最新赛季(当 season 为空时)
+    latest_seasons: dict[int, str] = {}
+    if season is None:
+        rows = (
+            await db.execute(
+                select(Standing.league_id, func.max(Standing.season).label("latest"))
+                .group_by(Standing.league_id)
+            )
+        ).all()
+        latest_seasons = {r.league_id: r.latest for r in rows}
+
+    q = (
+        select(Standing, League)
+        .join(League, League.id == Standing.league_id)
+        .order_by(League.name.asc(), Standing.position.asc())
+    )
+    if league:
+        q = q.where(League.code == league)
+    if season:
+        q = q.where(Standing.season == season)
+    else:
+        # 多联赛时只保留各联赛最新赛季
+        if latest_seasons:
+            q = q.where(
+                or_(
+                    *(
+                        (Standing.league_id == lid) & (Standing.season == ls)
+                        for lid, ls in latest_seasons.items()
+                    )
+                )
+            )
+
+    rows = (await db.execute(q)).all()
+
+    # 按联赛分组
+    grouped: dict[str, dict] = {}
+    for standing, lg in rows:
+        key = lg.code
+        if key not in grouped:
+            grouped[key] = {
+                "league_code": lg.code,
+                "league_name": lg.name,
+                "season": standing.season,
+                "retrieved_at": standing.retrieved_at.isoformat() if standing.retrieved_at else None,
+                "rows": [],
+            }
+        grouped[key]["rows"].append(
+            {
+                "position": standing.position,
+                "team": standing.team.name_zh or standing.team.name if standing.team else "?",
+                "team_en": standing.team.name if standing.team else "?",
+                "played": standing.played,
+                "won": standing.won,
+                "drawn": standing.drawn,
+                "lost": standing.lost,
+                "goals_for": standing.goals_for,
+                "goals_against": standing.goals_against,
+                "goal_diff": standing.goal_diff,
+                "points": standing.points,
+                "xg_for": standing.xg_for,
+                "xg_against": standing.xg_against,
+                "form": standing.form,
+                "zone": standing.zone,
+            }
+        )
+    return {"leagues": list(grouped.values())}