Code Review 第二轮修复:前端 HTTP 统一 + 数据采集可靠性

F1: 统一前端 HTTP 客户端
- 新增 frontend/src/lib/http.ts(共享客户端,统一超时/错误/401 处理)
- Matches.tsx 的列表/分页/进行中/预测请求改用 http 客户端
- 公开站与 Admin 行为一致

D2: events 采集按联赛分批提交
- _run_bzzoiro 改为 per-league 独立事务,避免超长事务
- 单联赛失败不影响其他联赛

F3: 仪表盘真实计数
- admin_stats 补充 matches/stats/standings 真实聚合
- Dashboard 展示比赛总数/已完赛/统计行/积分榜

F4: LLM 连通性测试不依赖 match_id=1
- 新增 POST /admin/llm/ping 端点(只发一次 chat,不依赖比赛)
- testLLMConnection 优先调用 ping,失败回退旧方式

F5: 导航改用 React Router Link
- App.tsx 中 <a href> 全部替换为 <Link to>

D5: 删除 away_possession 死代码
- bzzoiro.py 中移除计算与注释

D1: 管线基础设施表文档化
- RawEvent/IngestFailure/DataQualityCheck/DataLineage 添加「预留未启用」注释

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

src/api/routes/admin_settings.py

@@ -293,6 +293,21 @@ async def test_datasource(name: str):
     raise HTTPException(404, f"未知数据源: {name}")
 
 
+@router.post("/llm/ping")
+async def llm_ping():
+    """LLM 连通性测试(不依赖比赛)。只发一次 chat 请求验证配置。"""
+    from src.llm.provider import get_default_provider
+    p = await get_default_provider()
+    resp = await p.chat(
+        system="你是测试助手。",
+        user="ping",
+        max_tokens=10,
+    )
+    if resp.error:
+        return {"ok": False, "message": resp.error}
+    return {"ok": True, "message": "LLM 连接正常", "model": p.model}
+
+
 # ── 数据源健康/最近采集状态(只读,不触发采集) ──────────────────────
 
 
@@ -387,9 +402,9 @@ def _last_failure_log(source: str) -> dict | None:
 
 @router.get("/stats")
 async def admin_stats(db: AsyncSession = Depends(get_db_read)):
-    """管理区统计(只读):最近预测次数。轻量聚合,无 LLM 调用。"""
+    """管理区统计(只读):预测次数 + 比赛覆盖。轻量聚合,无 LLM 调用。"""
     from sqlalchemy import func, text
-    from src.db.models import Prediction
+    from src.db.models import Prediction, Match, MatchStats, Standing
     day_ago = datetime.now(timezone.utc) - timedelta(days=1)
     week_ago = datetime.now(timezone.utc) - timedelta(days=7)
     r = (
@@ -401,7 +416,17 @@ async def admin_stats(db: AsyncSession = Depends(get_db_read)):
             )
         )
     ).one()
-    return {"predictions": {"total": r.total, "last_24h": r.last_24h, "last_7d": r.last_7d}}
+    # F3 修复: 补充真实比赛计数(非 limit=100 近似)
+    match_cnt = (await db.execute(select(func.count()).select_from(Match))).scalar() or 0
+    finished_cnt = (await db.execute(select(func.count()).where(Match.match_status == "finished"))).scalar() or 0
+    stats_cnt = (await db.execute(select(func.count()).select_from(MatchStats))).scalar() or 0
+    standings_cnt = (await db.execute(select(func.count()).select_from(Standing))).scalar() or 0
+    return {
+        "predictions": {"total": r.total, "last_24h": r.last_24h, "last_7d": r.last_7d},
+        "matches": {"total": match_cnt, "finished": finished_cnt},
+        "stats": {"total": stats_cnt},
+        "standings": {"total": standings_cnt},
+    }
 
 
 # ── 数据完整性分析(可视化数据源) ────────────────────────────────

src/api/routes/ingest.py

@@ -58,20 +58,21 @@ async def _run_bzzoiro(task: str, leagues: list[str], req: IngestBzzoiroRequest)
             statuses = [req.status] if req.status else ["finished", "scheduled"]
             source = get_source("bzzoiro")
             merged: dict = {"leagues": {}, "total_inserted": 0, "total_updated": 0, "errors": []}
-            async with get_uow() as session:
+            # D2 修复: 按联赛分批提交,避免超长事务
+            for code in leagues:
                 for st in statuses:
-                    r = await source.ingest(
-                        session, leagues=leagues,
-                        date_from=req.date_from, date_to=req.date_to, status=st,
-                    )
-                    merged["total_inserted"] += r.get("total_inserted", 0)
-                    merged["total_updated"] += r.get("total_updated", 0)
-                    merged["errors"].extend(r.get("errors", []))
-                    for code, stat in r.get("leagues", {}).items():
+                    async with get_uow() as session:
+                        r = await source.ingest(
+                            session, leagues=[code],
+                            date_from=req.date_from, date_to=req.date_to, status=st,
+                        )
+                        merged["total_inserted"] += r.get("total_inserted", 0)
+                        merged["total_updated"] += r.get("total_updated", 0)
+                        merged["errors"].extend(r.get("errors", []))
                         acc = merged["leagues"].setdefault(code, {"inserted": 0, "updated": 0, "errors": []})
-                        acc["inserted"] += stat.get("inserted", 0)
-                        acc["updated"] += stat.get("updated", 0)
-                        acc["errors"].extend(stat.get("errors", []))
+                        acc["inserted"] += r.get("inserted", 0)
+                        acc["updated"] += r.get("updated", 0)
+                        acc["errors"].extend(r.get("errors", []))
             logger.info(
                 "bzzoiro 比赛采集完成: 新增 %d, 更新 %d, 联赛 %d 个, 状态 %s",
                 merged["total_inserted"], merged["total_updated"], len(merged["leagues"]), statuses,