feat(channel-monitor): add feature switch settings + fix extra_models save

Settings:
- New "功能开关" tab between 通用设置 and 安全与认证
- ChannelMonitorEnabled toggle: runner skips scheduling when false,
  user-facing list returns empty
- ChannelMonitorDefaultIntervalSeconds (15-3600): pre-fills interval
  when creating a new monitor; each monitor can still override

Bug fix:
- ModelTagInput now commits pending input on blur, not just Enter/Tab.
  Previously clicking "save" with an un-Enter'd extra model would drop
  the value (DB stored extra_models=[] even when user typed entries).

Backend:
- domain_constants: SettingKeyChannelMonitor{Enabled,DefaultIntervalSeconds}
- SettingService.GetChannelMonitorRuntime: lightweight getter used by
  runner tick + user handler per-request (fail-open on DB error)
- Runner tickDueChecks: bails early when feature disabled
- ChannelMonitorUserHandler: checks feature flag before serving
- Comment on runner doc: scheduler state is implicit (every tick re-reads
  ListEnabled from DB), so CRUD ops on monitors self-maintain the schedule

Bump VERSION to 0.1.114.25

backend/cmd/server/wire_gen.go

@@ -217,8 +217,8 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	channelMonitorRepository := repository.NewChannelMonitorRepository(client, sqlDB)
 	channelMonitorService := service.ProvideChannelMonitorService(channelMonitorRepository, secretEncryptor)
 	channelMonitorHandler := admin.NewChannelMonitorHandler(channelMonitorService)
-	channelMonitorUserHandler := handler.NewChannelMonitorUserHandler(channelMonitorService)
-	channelMonitorRunner := service.ProvideChannelMonitorRunner(channelMonitorService)
+	channelMonitorUserHandler := handler.NewChannelMonitorUserHandler(channelMonitorService, settingService)
+	channelMonitorRunner := service.ProvideChannelMonitorRunner(channelMonitorService, settingService)
 	_ = channelMonitorRunner
 	registry := payment.ProvideRegistry()
 	encryptionKey, err := payment.ProvideEncryptionKey(configConfig)