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/channelmonitorhistory.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"time"
 
+	"entgo.io/ent"
 	"entgo.io/ent/dialect/sql"
 	"entgo.io/ent/dialect/sql/sqlgraph"
 )
@@ -15,6 +16,8 @@ const (
 	Label = "channel_monitor_history"
 	// FieldID holds the string denoting the id field in the database.
 	FieldID = "id"
+	// FieldDeletedAt holds the string denoting the deleted_at field in the database.
+	FieldDeletedAt = "deleted_at"
 	// FieldMonitorID holds the string denoting the monitor_id field in the database.
 	FieldMonitorID = "monitor_id"
 	// FieldModel holds the string denoting the model field in the database.
@@ -45,6 +48,7 @@ const (
 // Columns holds all SQL columns for channelmonitorhistory fields.
 var Columns = []string{
 	FieldID,
+	FieldDeletedAt,
 	FieldMonitorID,
 	FieldModel,
 	FieldStatus,
@@ -64,7 +68,14 @@ func ValidColumn(column string) bool {
 	return false
 }
 
+// Note that the variables below are initialized by the runtime
+// package on the initialization of the application. Therefore,
+// it should be imported in the main as follows:
+//
+//	import _ "github.com/Wei-Shaw/sub2api/ent/runtime"
 var (
+	Hooks        [1]ent.Hook
+	Interceptors [1]ent.Interceptor
 	// ModelValidator is a validator for the "model" field. It is called by the builders before save.
 	ModelValidator func(string) error
 	// DefaultMessage holds the default value on creation for the "message" field.
@@ -108,6 +119,11 @@ func ByID(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldID, opts...).ToFunc()
 }
 
+// ByDeletedAt orders the results by the deleted_at field.
+func ByDeletedAt(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldDeletedAt, opts...).ToFunc()
+}
+
 // ByMonitorID orders the results by the monitor_id field.
 func ByMonitorID(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldMonitorID, opts...).ToFunc()