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>>

tests/test_multi_agent_degraded.py

@@ -30,7 +30,7 @@ def _all_error_reports():
         AgentReport(agent="form", status="error", analysis="slice failed"),
         AgentReport(agent="stats", status="error", analysis="slice failed"),
         AgentReport(agent="home_away", status="error", analysis="slice failed"),
-        AgentReport(agent="injuries", status="error", analysis="slice failed"),
+        AgentReport(agent="standings", status="error", analysis="slice failed"),
         AgentReport(agent="h2h", status="error", analysis="slice failed"),
     ]
 
@@ -41,7 +41,7 @@ def _all_no_data_reports():
         AgentReport(agent="form", status="no_data", analysis="无数据"),
         AgentReport(agent="stats", status="no_data", analysis="无数据"),
         AgentReport(agent="home_away", status="no_data", analysis="无数据"),
-        AgentReport(agent="injuries", status="no_data", analysis="无数据"),
+        AgentReport(agent="standings", status="no_data", analysis="无数据"),
         AgentReport(agent="h2h", status="no_data", analysis="无数据"),
     ]
 
@@ -52,7 +52,7 @@ def _mixed_reports():
         AgentReport(agent="form", status="ok", analysis="good"),
         AgentReport(agent="stats", status="error", analysis="failed"),
         AgentReport(agent="home_away", status="no_data", analysis="无数据"),
-        AgentReport(agent="injuries", status="error", analysis="failed"),
+        AgentReport(agent="standings", status="error", analysis="failed"),
         AgentReport(agent="h2h", status="no_data", analysis="无数据"),
     ]