feat(channel-monitor): aggregate history to daily rollups + soft delete

明细只保留 1 天，超过 1 天聚合到新表 channel_monitor_daily_rollups（按
monitor_id/model/bucket_date 维度），聚合保留 30 天。两张表都用 SoftDeleteMixin
软删除（DELETE 自动改为 UPDATE deleted_at = NOW()）。

聚合 + 清理任务由 OpsCleanupService 的 cron 统一调度，与运维监控的清理共享
schedule（默认 0 2 * * *）和 leader lock。ChannelMonitorRunner 的 cleanupLoop
被移除，只保留 dueCheckLoop。

读取路径 ComputeAvailability* 改为 UNION 明细（今天 deleted_at IS NULL）+
聚合（过去 windowDays 天 deleted_at IS NULL），SUM(ok)/SUM(total) 自然加权
计算可用率，AVG latency 用 SUM(sum_latency_ms)/SUM(count_latency)。

watermark 表 channel_monitor_aggregation_watermark 单行（id=1），记录
last_aggregated_date，重启后从该日期 +1 继续聚合，首次为 nil 则从
today - 30d 开始回填，单次最多 35 天上限避免长事务。

raw SQL 的 ListLatestPerModel / ListLatestForMonitorIDs / ListRecentHistoryForMonitors
都补上 deleted_at IS NULL 过滤（SoftDeleteMixin interceptor 只对 ent query 生效）。

bump version to 0.1.114.28

GroupBadge 在 MonitorKeyPickerDialog 中复用平台主题色 + 倍率/专属倍率
（顺手优化）。

backend/ent/channelmonitorhistory/where.go

@@ -55,6 +55,11 @@ func IDLTE(id int64) predicate.ChannelMonitorHistory {
 	return predicate.ChannelMonitorHistory(sql.FieldLTE(FieldID, id))
 }
 
+// DeletedAt applies equality check predicate on the "deleted_at" field. It's identical to DeletedAtEQ.
+func DeletedAt(v time.Time) predicate.ChannelMonitorHistory {
+	return predicate.ChannelMonitorHistory(sql.FieldEQ(FieldDeletedAt, v))
+}
+
 // MonitorID applies equality check predicate on the "monitor_id" field. It's identical to MonitorIDEQ.
 func MonitorID(v int64) predicate.ChannelMonitorHistory {
 	return predicate.ChannelMonitorHistory(sql.FieldEQ(FieldMonitorID, v))
@@ -85,6 +90,56 @@ func CheckedAt(v time.Time) predicate.ChannelMonitorHistory {
 	return predicate.ChannelMonitorHistory(sql.FieldEQ(FieldCheckedAt, v))
 }
 
+// DeletedAtEQ applies the EQ predicate on the "deleted_at" field.
+func DeletedAtEQ(v time.Time) predicate.ChannelMonitorHistory {
+	return predicate.ChannelMonitorHistory(sql.FieldEQ(FieldDeletedAt, v))
+}
+
+// DeletedAtNEQ applies the NEQ predicate on the "deleted_at" field.
+func DeletedAtNEQ(v time.Time) predicate.ChannelMonitorHistory {
+	return predicate.ChannelMonitorHistory(sql.FieldNEQ(FieldDeletedAt, v))
+}
+
+// DeletedAtIn applies the In predicate on the "deleted_at" field.
+func DeletedAtIn(vs ...time.Time) predicate.ChannelMonitorHistory {
+	return predicate.ChannelMonitorHistory(sql.FieldIn(FieldDeletedAt, vs...))
+}
+
+// DeletedAtNotIn applies the NotIn predicate on the "deleted_at" field.
+func DeletedAtNotIn(vs ...time.Time) predicate.ChannelMonitorHistory {
+	return predicate.ChannelMonitorHistory(sql.FieldNotIn(FieldDeletedAt, vs...))
+}
+
+// DeletedAtGT applies the GT predicate on the "deleted_at" field.
+func DeletedAtGT(v time.Time) predicate.ChannelMonitorHistory {
+	return predicate.ChannelMonitorHistory(sql.FieldGT(FieldDeletedAt, v))
+}
+
+// DeletedAtGTE applies the GTE predicate on the "deleted_at" field.
+func DeletedAtGTE(v time.Time) predicate.ChannelMonitorHistory {
+	return predicate.ChannelMonitorHistory(sql.FieldGTE(FieldDeletedAt, v))
+}
+
+// DeletedAtLT applies the LT predicate on the "deleted_at" field.
+func DeletedAtLT(v time.Time) predicate.ChannelMonitorHistory {
+	return predicate.ChannelMonitorHistory(sql.FieldLT(FieldDeletedAt, v))
+}
+
+// DeletedAtLTE applies the LTE predicate on the "deleted_at" field.
+func DeletedAtLTE(v time.Time) predicate.ChannelMonitorHistory {
+	return predicate.ChannelMonitorHistory(sql.FieldLTE(FieldDeletedAt, v))
+}
+
+// DeletedAtIsNil applies the IsNil predicate on the "deleted_at" field.
+func DeletedAtIsNil() predicate.ChannelMonitorHistory {
+	return predicate.ChannelMonitorHistory(sql.FieldIsNull(FieldDeletedAt))
+}
+
+// DeletedAtNotNil applies the NotNil predicate on the "deleted_at" field.
+func DeletedAtNotNil() predicate.ChannelMonitorHistory {
+	return predicate.ChannelMonitorHistory(sql.FieldNotNull(FieldDeletedAt))
+}
+
 // MonitorIDEQ applies the EQ predicate on the "monitor_id" field.
 func MonitorIDEQ(v int64) predicate.ChannelMonitorHistory {
 	return predicate.ChannelMonitorHistory(sql.FieldEQ(FieldMonitorID, v))