feat(channel-monitor): apply template via subset picker; CC 2.1.114 baseline doc

Apply flow:
- POST /admin/channel-monitor-templates/:id/apply now requires monitor_ids
  (non-empty array). Service applies the template only to the selected
  subset, gated by AND template_id = :id (so users can't sneak in
  unrelated monitor IDs).
- New GET /admin/channel-monitor-templates/:id/monitors returns the
  associated monitor briefs (id/name/provider/enabled) for the picker.
- ApplyToMonitors signature gains monitorIDs []int64; empty list returns
  ErrChannelMonitorTemplateApplyEmpty.

Frontend:
- New MonitorTemplateApplyPickerDialog.vue: list of associated monitors
  with checkboxes (default all checked), 全选 / 全不选 shortcuts, live
  selected/total count. Submit calls apply(id, ids).
- MonitorTemplateManagerDialog replaces the old ConfirmDialog flow with
  the picker; onApplied refetches the list to refresh associated counts.

i18n: applyPicker* + common.selectAll keys.

chore: bump version to 0.1.114.33

The CC 2.1.114 (sdk-cli) UA / APIKeyBetaHeader / JSON metadata.user_id
baseline (already verified working via the in-process apply on prod
template id=1) is documented in internal/pkg/claude/constants.go and
is what the seed template in the manager UI should follow.

backend/internal/repository/channel_monitor_template_repo.go

@@ -103,11 +103,13 @@ func (r *channelMonitorRequestTemplateRepository) List(ctx context.Context, para
 	return out, nil
 }
 
-// ApplyToMonitors 把模板当前配置批量覆盖到 template_id = id 的监控上。
-//
-// 用一条 UPDATE 完成：extra_headers / body_override_mode / body_override 都覆盖。
-// 走 ent 的 UpdateMany 保证走 ent hooks；走原生 SQL 也可以但 ent jsonb 序列化更省心。
-func (r *channelMonitorRequestTemplateRepository) ApplyToMonitors(ctx context.Context, id int64) (int64, error) {
+// ApplyToMonitors 把模板当前配置覆盖到 monitorIDs 列表里的关联监控。
+// WHERE 双重过滤：template_id = id AND id IN (monitorIDs)，防止用户传了未关联本模板的 id
+// 就被覆盖。走 ent UpdateMany 保留 hooks。
+func (r *channelMonitorRequestTemplateRepository) ApplyToMonitors(ctx context.Context, id int64, monitorIDs []int64) (int64, error) {
+	if len(monitorIDs) == 0 {
+		return 0, nil
+	}
 	client := clientFromContext(ctx, r.client)
 	tpl, err := client.ChannelMonitorRequestTemplate.Query().
 		Where(channelmonitorrequesttemplate.IDEQ(id)).
@@ -117,7 +119,10 @@ func (r *channelMonitorRequestTemplateRepository) ApplyToMonitors(ctx context.Co
 	}
 
 	updater := client.ChannelMonitor.Update().
-		Where(channelmonitor.TemplateIDEQ(id)).
+		Where(
+			channelmonitor.TemplateIDEQ(id),
+			channelmonitor.IDIn(monitorIDs...),
+		).
 		SetExtraHeaders(emptyHeadersIfNilRepo(tpl.ExtraHeaders)).
 		SetBodyOverrideMode(defaultBodyModeRepo(tpl.BodyOverrideMode))
 	if tpl.BodyOverride != nil {
@@ -144,6 +149,28 @@ func (r *channelMonitorRequestTemplateRepository) CountAssociatedMonitors(ctx co
 	return int64(count), nil
 }
 
+// ListAssociatedMonitors 列出模板关联的所有监控简略字段。
+// ORDER BY name 稳定输出方便前端展示。
+func (r *channelMonitorRequestTemplateRepository) ListAssociatedMonitors(ctx context.Context, id int64) ([]*service.AssociatedMonitorBrief, error) {
+	rows, err := r.client.ChannelMonitor.Query().
+		Where(channelmonitor.TemplateIDEQ(id)).
+		Order(dbent.Asc(channelmonitor.FieldName)).
+		All(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("list associated monitors for template %d: %w", id, err)
+	}
+	out := make([]*service.AssociatedMonitorBrief, 0, len(rows))
+	for _, row := range rows {
+		out = append(out, &service.AssociatedMonitorBrief{
+			ID:       row.ID,
+			Name:     row.Name,
+			Provider: string(row.Provider),
+			Enabled:  row.Enabled,
+		})
+	}
+	return out, nil
+}
+
 // ---------- helpers ----------
 
 func entToServiceTemplate(row *dbent.ChannelMonitorRequestTemplate) *service.ChannelMonitorRequestTemplate {