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_query.go

@@ -14,6 +14,7 @@ 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"
 	"github.com/Wei-Shaw/sub2api/ent/predicate"
 )
@@ -21,12 +22,13 @@ import (
 // ChannelMonitorQuery is the builder for querying ChannelMonitor entities.
 type ChannelMonitorQuery struct {
 	config
-	ctx         *QueryContext
-	order       []channelmonitor.OrderOption
-	inters      []Interceptor
-	predicates  []predicate.ChannelMonitor
-	withHistory *ChannelMonitorHistoryQuery
-	modifiers   []func(*sql.Selector)
+	ctx              *QueryContext
+	order            []channelmonitor.OrderOption
+	inters           []Interceptor
+	predicates       []predicate.ChannelMonitor
+	withHistory      *ChannelMonitorHistoryQuery
+	withDailyRollups *ChannelMonitorDailyRollupQuery
+	modifiers        []func(*sql.Selector)
 	// intermediate query (i.e. traversal path).
 	sql  *sql.Selector
 	path func(context.Context) (*sql.Selector, error)
@@ -85,6 +87,28 @@ func (_q *ChannelMonitorQuery) QueryHistory() *ChannelMonitorHistoryQuery {
 	return query
 }
 
+// QueryDailyRollups chains the current query on the "daily_rollups" edge.
+func (_q *ChannelMonitorQuery) QueryDailyRollups() *ChannelMonitorDailyRollupQuery {
+	query := (&ChannelMonitorDailyRollupClient{config: _q.config}).Query()
+	query.path = func(ctx context.Context) (fromU *sql.Selector, err error) {
+		if err := _q.prepareQuery(ctx); err != nil {
+			return nil, err
+		}
+		selector := _q.sqlQuery(ctx)
+		if err := selector.Err(); err != nil {
+			return nil, err
+		}
+		step := sqlgraph.NewStep(
+			sqlgraph.From(channelmonitor.Table, channelmonitor.FieldID, selector),
+			sqlgraph.To(channelmonitordailyrollup.Table, channelmonitordailyrollup.FieldID),
+			sqlgraph.Edge(sqlgraph.O2M, false, channelmonitor.DailyRollupsTable, channelmonitor.DailyRollupsColumn),
+		)
+		fromU = sqlgraph.SetNeighbors(_q.driver.Dialect(), step)
+		return fromU, nil
+	}
+	return query
+}
+
 // First returns the first ChannelMonitor entity from the query.
 // Returns a *NotFoundError when no ChannelMonitor was found.
 func (_q *ChannelMonitorQuery) First(ctx context.Context) (*ChannelMonitor, error) {
@@ -272,12 +296,13 @@ func (_q *ChannelMonitorQuery) Clone() *ChannelMonitorQuery {
 		return nil
 	}
 	return &ChannelMonitorQuery{
-		config:      _q.config,
-		ctx:         _q.ctx.Clone(),
-		order:       append([]channelmonitor.OrderOption{}, _q.order...),
-		inters:      append([]Interceptor{}, _q.inters...),
-		predicates:  append([]predicate.ChannelMonitor{}, _q.predicates...),
-		withHistory: _q.withHistory.Clone(),
+		config:           _q.config,
+		ctx:              _q.ctx.Clone(),
+		order:            append([]channelmonitor.OrderOption{}, _q.order...),
+		inters:           append([]Interceptor{}, _q.inters...),
+		predicates:       append([]predicate.ChannelMonitor{}, _q.predicates...),
+		withHistory:      _q.withHistory.Clone(),
+		withDailyRollups: _q.withDailyRollups.Clone(),
 		// clone intermediate query.
 		sql:  _q.sql.Clone(),
 		path: _q.path,
@@ -295,6 +320,17 @@ func (_q *ChannelMonitorQuery) WithHistory(opts ...func(*ChannelMonitorHistoryQu
 	return _q
 }
 
+// WithDailyRollups tells the query-builder to eager-load the nodes that are connected to
+// the "daily_rollups" edge. The optional arguments are used to configure the query builder of the edge.
+func (_q *ChannelMonitorQuery) WithDailyRollups(opts ...func(*ChannelMonitorDailyRollupQuery)) *ChannelMonitorQuery {
+	query := (&ChannelMonitorDailyRollupClient{config: _q.config}).Query()
+	for _, opt := range opts {
+		opt(query)
+	}
+	_q.withDailyRollups = query
+	return _q
+}
+
 // GroupBy is used to group vertices by one or more fields/columns.
 // It is often used with aggregate functions, like: count, max, mean, min, sum.
 //
@@ -373,8 +409,9 @@ func (_q *ChannelMonitorQuery) sqlAll(ctx context.Context, hooks ...queryHook) (
 	var (
 		nodes       = []*ChannelMonitor{}
 		_spec       = _q.querySpec()
-		loadedTypes = [1]bool{
+		loadedTypes = [2]bool{
 			_q.withHistory != nil,
+			_q.withDailyRollups != nil,
 		}
 	)
 	_spec.ScanValues = func(columns []string) ([]any, error) {
@@ -405,6 +442,15 @@ func (_q *ChannelMonitorQuery) sqlAll(ctx context.Context, hooks ...queryHook) (
 			return nil, err
 		}
 	}
+	if query := _q.withDailyRollups; query != nil {
+		if err := _q.loadDailyRollups(ctx, query, nodes,
+			func(n *ChannelMonitor) { n.Edges.DailyRollups = []*ChannelMonitorDailyRollup{} },
+			func(n *ChannelMonitor, e *ChannelMonitorDailyRollup) {
+				n.Edges.DailyRollups = append(n.Edges.DailyRollups, e)
+			}); err != nil {
+			return nil, err
+		}
+	}
 	return nodes, nil
 }
 
@@ -438,6 +484,36 @@ func (_q *ChannelMonitorQuery) loadHistory(ctx context.Context, query *ChannelMo
 	}
 	return nil
 }
+func (_q *ChannelMonitorQuery) loadDailyRollups(ctx context.Context, query *ChannelMonitorDailyRollupQuery, nodes []*ChannelMonitor, init func(*ChannelMonitor), assign func(*ChannelMonitor, *ChannelMonitorDailyRollup)) error {
+	fks := make([]driver.Value, 0, len(nodes))
+	nodeids := make(map[int64]*ChannelMonitor)
+	for i := range nodes {
+		fks = append(fks, nodes[i].ID)
+		nodeids[nodes[i].ID] = nodes[i]
+		if init != nil {
+			init(nodes[i])
+		}
+	}
+	if len(query.ctx.Fields) > 0 {
+		query.ctx.AppendFieldOnce(channelmonitordailyrollup.FieldMonitorID)
+	}
+	query.Where(predicate.ChannelMonitorDailyRollup(func(s *sql.Selector) {
+		s.Where(sql.InValues(s.C(channelmonitor.DailyRollupsColumn), fks...))
+	}))
+	neighbors, err := query.All(ctx)
+	if err != nil {
+		return err
+	}
+	for _, n := range neighbors {
+		fk := n.MonitorID
+		node, ok := nodeids[fk]
+		if !ok {
+			return fmt.Errorf(`unexpected referenced foreign-key "monitor_id" returned %v for node %v`, fk, n.ID)
+		}
+		assign(node, n)
+	}
+	return nil
+}
 
 func (_q *ChannelMonitorQuery) sqlCount(ctx context.Context) (int, error) {
 	_spec := _q.querySpec()