Simon
93e32f4e63
feat(data): B1-2 指数成分同步（Provider + CLI sync index_weight）
- MarketDataProvider.get_index_weight（协议）；Tushare 实现 normalize_index_weight +
get_index_weight（ts_code=... 全历史成分权重）；Sina 抛 DataSourceNotSupported；
FailoverProvider 代理并审计每次尝试
- CLI：sync index_weight --code 000300.SH（拉取→幂等落库 index_weight→打印最新快照；
失败走 sync_log 审计并返回非零）
- tests：Tushare 映射与调用（FakePro）、Failover 主源单源语义（新浪不支持被审计）；
全量 pytest 通过
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