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_update.go

@@ -29,6 +29,26 @@ func (_u *ChannelMonitorHistoryUpdate) Where(ps ...predicate.ChannelMonitorHisto
 	return _u
 }
 
+// SetDeletedAt sets the "deleted_at" field.
+func (_u *ChannelMonitorHistoryUpdate) SetDeletedAt(v time.Time) *ChannelMonitorHistoryUpdate {
+	_u.mutation.SetDeletedAt(v)
+	return _u
+}
+
+// SetNillableDeletedAt sets the "deleted_at" field if the given value is not nil.
+func (_u *ChannelMonitorHistoryUpdate) SetNillableDeletedAt(v *time.Time) *ChannelMonitorHistoryUpdate {
+	if v != nil {
+		_u.SetDeletedAt(*v)
+	}
+	return _u
+}
+
+// ClearDeletedAt clears the value of the "deleted_at" field.
+func (_u *ChannelMonitorHistoryUpdate) ClearDeletedAt() *ChannelMonitorHistoryUpdate {
+	_u.mutation.ClearDeletedAt()
+	return _u
+}
+
 // SetMonitorID sets the "monitor_id" field.
 func (_u *ChannelMonitorHistoryUpdate) SetMonitorID(v int64) *ChannelMonitorHistoryUpdate {
 	_u.mutation.SetMonitorID(v)
@@ -237,6 +257,12 @@ func (_u *ChannelMonitorHistoryUpdate) sqlSave(ctx context.Context) (_node int,
 			}
 		}
 	}
+	if value, ok := _u.mutation.DeletedAt(); ok {
+		_spec.SetField(channelmonitorhistory.FieldDeletedAt, field.TypeTime, value)
+	}
+	if _u.mutation.DeletedAtCleared() {
+		_spec.ClearField(channelmonitorhistory.FieldDeletedAt, field.TypeTime)
+	}
 	if value, ok := _u.mutation.Model(); ok {
 		_spec.SetField(channelmonitorhistory.FieldModel, field.TypeString, value)
 	}
@@ -319,6 +345,26 @@ type ChannelMonitorHistoryUpdateOne struct {
 	mutation *ChannelMonitorHistoryMutation
 }
 
+// SetDeletedAt sets the "deleted_at" field.
+func (_u *ChannelMonitorHistoryUpdateOne) SetDeletedAt(v time.Time) *ChannelMonitorHistoryUpdateOne {
+	_u.mutation.SetDeletedAt(v)
+	return _u
+}
+
+// SetNillableDeletedAt sets the "deleted_at" field if the given value is not nil.
+func (_u *ChannelMonitorHistoryUpdateOne) SetNillableDeletedAt(v *time.Time) *ChannelMonitorHistoryUpdateOne {
+	if v != nil {
+		_u.SetDeletedAt(*v)
+	}
+	return _u
+}
+
+// ClearDeletedAt clears the value of the "deleted_at" field.
+func (_u *ChannelMonitorHistoryUpdateOne) ClearDeletedAt() *ChannelMonitorHistoryUpdateOne {
+	_u.mutation.ClearDeletedAt()
+	return _u
+}
+
 // SetMonitorID sets the "monitor_id" field.
 func (_u *ChannelMonitorHistoryUpdateOne) SetMonitorID(v int64) *ChannelMonitorHistoryUpdateOne {
 	_u.mutation.SetMonitorID(v)
@@ -557,6 +603,12 @@ func (_u *ChannelMonitorHistoryUpdateOne) sqlSave(ctx context.Context) (_node *C
 			}
 		}
 	}
+	if value, ok := _u.mutation.DeletedAt(); ok {
+		_spec.SetField(channelmonitorhistory.FieldDeletedAt, field.TypeTime, value)
+	}
+	if _u.mutation.DeletedAtCleared() {
+		_spec.ClearField(channelmonitorhistory.FieldDeletedAt, field.TypeTime)
+	}
 	if value, ok := _u.mutation.Model(); ok {
 		_spec.SetField(channelmonitorhistory.FieldModel, field.TypeString, value)
 	}