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/migrate/schema.go

@@ -461,9 +461,55 @@ var (
 			},
 		},
 	}
+	// ChannelMonitorDailyRollupsColumns holds the columns for the "channel_monitor_daily_rollups" table.
+	ChannelMonitorDailyRollupsColumns = []*schema.Column{
+		{Name: "id", Type: field.TypeInt64, Increment: true},
+		{Name: "deleted_at", Type: field.TypeTime, Nullable: true, SchemaType: map[string]string{"postgres": "timestamptz"}},
+		{Name: "model", Type: field.TypeString, Size: 200},
+		{Name: "bucket_date", Type: field.TypeTime, SchemaType: map[string]string{"postgres": "date"}},
+		{Name: "total_checks", Type: field.TypeInt, Default: 0},
+		{Name: "ok_count", Type: field.TypeInt, Default: 0},
+		{Name: "operational_count", Type: field.TypeInt, Default: 0},
+		{Name: "degraded_count", Type: field.TypeInt, Default: 0},
+		{Name: "failed_count", Type: field.TypeInt, Default: 0},
+		{Name: "error_count", Type: field.TypeInt, Default: 0},
+		{Name: "sum_latency_ms", Type: field.TypeInt64, Default: 0},
+		{Name: "count_latency", Type: field.TypeInt, Default: 0},
+		{Name: "sum_ping_latency_ms", Type: field.TypeInt64, Default: 0},
+		{Name: "count_ping_latency", Type: field.TypeInt, Default: 0},
+		{Name: "computed_at", Type: field.TypeTime},
+		{Name: "monitor_id", Type: field.TypeInt64},
+	}
+	// ChannelMonitorDailyRollupsTable holds the schema information for the "channel_monitor_daily_rollups" table.
+	ChannelMonitorDailyRollupsTable = &schema.Table{
+		Name:       "channel_monitor_daily_rollups",
+		Columns:    ChannelMonitorDailyRollupsColumns,
+		PrimaryKey: []*schema.Column{ChannelMonitorDailyRollupsColumns[0]},
+		ForeignKeys: []*schema.ForeignKey{
+			{
+				Symbol:     "channel_monitor_daily_rollups_channel_monitors_daily_rollups",
+				Columns:    []*schema.Column{ChannelMonitorDailyRollupsColumns[15]},
+				RefColumns: []*schema.Column{ChannelMonitorsColumns[0]},
+				OnDelete:   schema.Cascade,
+			},
+		},
+		Indexes: []*schema.Index{
+			{
+				Name:    "channelmonitordailyrollup_monitor_id_model_bucket_date",
+				Unique:  true,
+				Columns: []*schema.Column{ChannelMonitorDailyRollupsColumns[15], ChannelMonitorDailyRollupsColumns[2], ChannelMonitorDailyRollupsColumns[3]},
+			},
+			{
+				Name:    "channelmonitordailyrollup_bucket_date",
+				Unique:  false,
+				Columns: []*schema.Column{ChannelMonitorDailyRollupsColumns[3]},
+			},
+		},
+	}
 	// ChannelMonitorHistoriesColumns holds the columns for the "channel_monitor_histories" table.
 	ChannelMonitorHistoriesColumns = []*schema.Column{
 		{Name: "id", Type: field.TypeInt64, Increment: true},
+		{Name: "deleted_at", Type: field.TypeTime, Nullable: true, SchemaType: map[string]string{"postgres": "timestamptz"}},
 		{Name: "model", Type: field.TypeString, Size: 200},
 		{Name: "status", Type: field.TypeEnum, Enums: []string{"operational", "degraded", "failed", "error"}},
 		{Name: "latency_ms", Type: field.TypeInt, Nullable: true},
@@ -480,7 +526,7 @@ var (
 		ForeignKeys: []*schema.ForeignKey{
 			{
 				Symbol:     "channel_monitor_histories_channel_monitors_history",
-				Columns:    []*schema.Column{ChannelMonitorHistoriesColumns[7]},
+				Columns:    []*schema.Column{ChannelMonitorHistoriesColumns[8]},
 				RefColumns: []*schema.Column{ChannelMonitorsColumns[0]},
 				OnDelete:   schema.Cascade,
 			},
@@ -489,12 +535,12 @@ var (
 			{
 				Name:    "channelmonitorhistory_monitor_id_model_checked_at",
 				Unique:  false,
-				Columns: []*schema.Column{ChannelMonitorHistoriesColumns[7], ChannelMonitorHistoriesColumns[1], ChannelMonitorHistoriesColumns[6]},
+				Columns: []*schema.Column{ChannelMonitorHistoriesColumns[8], ChannelMonitorHistoriesColumns[2], ChannelMonitorHistoriesColumns[7]},
 			},
 			{
 				Name:    "channelmonitorhistory_checked_at",
 				Unique:  false,
-				Columns: []*schema.Column{ChannelMonitorHistoriesColumns[6]},
+				Columns: []*schema.Column{ChannelMonitorHistoriesColumns[7]},
 			},
 		},
 	}
@@ -1598,6 +1644,7 @@ var (
 		AuthIdentitiesTable,
 		AuthIdentityChannelsTable,
 		ChannelMonitorsTable,
+		ChannelMonitorDailyRollupsTable,
 		ChannelMonitorHistoriesTable,
 		ErrorPassthroughRulesTable,
 		GroupsTable,
@@ -1659,6 +1706,10 @@ func init() {
 	ChannelMonitorsTable.Annotation = &entsql.Annotation{
 		Table: "channel_monitors",
 	}
+	ChannelMonitorDailyRollupsTable.ForeignKeys[0].RefTable = ChannelMonitorsTable
+	ChannelMonitorDailyRollupsTable.Annotation = &entsql.Annotation{
+		Table: "channel_monitor_daily_rollups",
+	}
 	ChannelMonitorHistoriesTable.ForeignKeys[0].RefTable = ChannelMonitorsTable
 	ChannelMonitorHistoriesTable.Annotation = &entsql.Annotation{
 		Table: "channel_monitor_histories",