AskaEth
ec3f6e810a
feat(events): 渠道事件存储地基（Event/Store + SQLite 实现 + 有界计数聚合 + 保留期 GC + 迁移 0021）
- 新包 internal/runtime/events：Tier/Category/Platform/ChannelType/ActorRole 具名常量 + Event/Filter/Counter + Store 六方法
- 留存口径：T2/T3 逐条落行；T1 只计数；unknown / decode_error / link 三例外逐条落行（链路是否活着是事故定案唯一证据）
- 计数：内存聚合 + 上限 512 的有界缓冲 + 满即整批 upsert，落盘失败回填而不丢；GC：保留期 720h/间隔 1h，≤0 = 关闭
- 迁移 0021_channel_events（两表 + 6 索引，含计数 upsert 唯一键）；Event 无 flag/正文/URL 字段（design/26 §4.2 红线）
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