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/channelmonitor_create.go

@@ -12,6 +12,7 @@ import (
 	"entgo.io/ent/dialect/sql/sqlgraph"
 	"entgo.io/ent/schema/field"
 	"github.com/Wei-Shaw/sub2api/ent/channelmonitor"
+	"github.com/Wei-Shaw/sub2api/ent/channelmonitordailyrollup"
 	"github.com/Wei-Shaw/sub2api/ent/channelmonitorhistory"
 )
 
@@ -156,6 +157,21 @@ func (_c *ChannelMonitorCreate) AddHistory(v ...*ChannelMonitorHistory) *Channel
 	return _c.AddHistoryIDs(ids...)
 }
 
+// AddDailyRollupIDs adds the "daily_rollups" edge to the ChannelMonitorDailyRollup entity by IDs.
+func (_c *ChannelMonitorCreate) AddDailyRollupIDs(ids ...int64) *ChannelMonitorCreate {
+	_c.mutation.AddDailyRollupIDs(ids...)
+	return _c
+}
+
+// AddDailyRollups adds the "daily_rollups" edges to the ChannelMonitorDailyRollup entity.
+func (_c *ChannelMonitorCreate) AddDailyRollups(v ...*ChannelMonitorDailyRollup) *ChannelMonitorCreate {
+	ids := make([]int64, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _c.AddDailyRollupIDs(ids...)
+}
+
 // Mutation returns the ChannelMonitorMutation object of the builder.
 func (_c *ChannelMonitorCreate) Mutation() *ChannelMonitorMutation {
 	return _c.mutation
@@ -378,6 +394,22 @@ func (_c *ChannelMonitorCreate) createSpec() (*ChannelMonitor, *sqlgraph.CreateS
 		}
 		_spec.Edges = append(_spec.Edges, edge)
 	}
+	if nodes := _c.mutation.DailyRollupsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: false,
+			Table:   channelmonitor.DailyRollupsTable,
+			Columns: []string{channelmonitor.DailyRollupsColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(channelmonitordailyrollup.FieldID, field.TypeInt64),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges = append(_spec.Edges, edge)
+	}
 	return _node, _spec
 }