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>>

frontend/src/pages/Matches.tsx

@@ -3,6 +3,7 @@ import TeamSideTag from '../components/TeamSideTag'
 import { fetchMatchDetail, fetchMatchContext } from '../admin/dal'
 import type { MatchDetailOut, MatchContextOut, MatchRecentPrediction, TeamRecentMatch } from '../admin/types'
 import type { MatchStatsDetail } from '../admin/types'
+import { http } from '../lib/http'
 
 interface Match {
   id: number
@@ -238,11 +239,8 @@ export default function Matches() {
     setError(null)
     try {
       const params = new URLSearchParams({ league, status, limit: '50' })
-      const res = await fetch(`/api/v1/matches?${params}`)
+      const data = await http.get<{ items: Match[]; next_cursor: string | null }>(`/matches?${params}`)
       if (seq !== loadSeq.current) return // 已有更新的请求,丢弃本次结果
-      if (!res.ok) throw new Error(`HTTP ${res.status}`)
-      const data = await res.json()
-      if (seq !== loadSeq.current) return
       setMatches(data.items)
       setNextCursor(data.next_cursor ?? null)
     } catch (e) {
@@ -260,10 +258,7 @@ export default function Matches() {
     setLoadingMore(true)
     try {
       const params = new URLSearchParams({ league, status, limit: '50', cursor: nextCursor })
-      const res = await fetch(`/api/v1/matches?${params}`)
-      if (seq !== loadSeq.current) return
-      if (!res.ok) throw new Error(`HTTP ${res.status}`)
-      const data = await res.json()
+      const data = await http.get<{ items: Match[]; next_cursor: string | null }>(`/matches?${params}`)
       if (seq !== loadSeq.current) return
       setMatches(prev => [...prev, ...data.items])
       setNextCursor(data.next_cursor ?? null)
@@ -279,9 +274,7 @@ export default function Matches() {
   const loadLive = useCallback(async () => {
     try {
       const params = new URLSearchParams({ league, status: 'in_play', limit: '20' })
-      const res = await fetch(`/api/v1/matches?${params}`)
-      if (!res.ok) return
-      const data = await res.json()
+      const data = await http.get<{ items: Match[] }>(`/matches?${params}`)
       setLiveMatches(data.items ?? [])
     } catch {
       /* ignore:进行中非核心功能 */
@@ -340,19 +333,11 @@ export default function Matches() {
     predictAbort.current = controller
     const timer = setTimeout(() => controller.abort(), 300_000)
     try {
-      const res = await fetch('/api/v1/predict', {
-        method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ match_id: m.id, mode: 'multi' }),
+      const data = await http.post<Prediction>('/predict', { match_id: m.id, mode: 'multi' }, {
+        timeoutMs: 300_000,
         signal: controller.signal,
       })
       if (seq !== predictSeq.current) return
-      if (!res.ok) {
-        const t = await res.text()
-        throw new Error(`HTTP ${res.status}: ${t}`)
-      }
-      const data = await res.json()
-      if (seq !== predictSeq.current) return
       setPrediction(data)
     } catch (e) {
       if (seq !== predictSeq.current) return