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

frontend/src/api/admin/settings.ts

@@ -469,6 +469,10 @@ export interface SystemSettings {
   balance_low_notify_recharge_url: string;
   account_quota_notify_enabled: boolean;
   account_quota_notify_emails: NotifyEmailEntry[];
+
+  // Channel Monitor feature switch
+  channel_monitor_enabled: boolean;
+  channel_monitor_default_interval_seconds: number;
 }
 
 export interface UpdateSettingsRequest {
@@ -618,6 +622,10 @@ export interface UpdateSettingsRequest {
   balance_low_notify_recharge_url?: string;
   account_quota_notify_enabled?: boolean;
   account_quota_notify_emails?: NotifyEmailEntry[];
+
+  // Channel Monitor feature switch
+  channel_monitor_enabled?: boolean;
+  channel_monitor_default_interval_seconds?: number;
 }
 
 /**

frontend/src/components/admin/channel/ModelTagInput.vue

@@ -27,6 +27,7 @@
         @keydown.tab.prevent="addModel"
         @keydown.delete="handleBackspace"
         @paste="handlePaste"
+        @blur="addModel"
       />
     </div>
     <p class="mt-1 text-xs text-gray-400">

frontend/src/components/admin/monitor/MonitorFormDialog.vue

@@ -143,6 +143,13 @@ const emit = defineEmits<{
 const { t } = useI18n()
 const appStore = useAppStore()
 
+// System-configured default interval for new monitors. Falls back to the static
+// constant when public settings haven't loaded yet or store the legacy 0 value.
+const systemDefaultInterval = computed<number>(() => {
+  const configured = appStore.cachedPublicSettings?.channel_monitor_default_interval_seconds
+  return configured && configured > 0 ? configured : DEFAULT_INTERVAL_SECONDS
+})
+
 // editing is true when we have an existing monitor
 const editing = computed<ChannelMonitor | null>(() => props.monitor)
 
@@ -173,7 +180,7 @@ const form = reactive<MonitorForm>({
   primary_model: '',
   extra_models: [],
   group_name: '',
-  interval_seconds: DEFAULT_INTERVAL_SECONDS,
+  interval_seconds: systemDefaultInterval.value,
   enabled: true,
 })
 
@@ -191,7 +198,7 @@ function resetForm() {
   form.primary_model = ''
   form.extra_models = []
   form.group_name = ''
-  form.interval_seconds = DEFAULT_INTERVAL_SECONDS
+  form.interval_seconds = systemDefaultInterval.value
   form.enabled = true
 }
 
@@ -203,7 +210,7 @@ function loadFromMonitor(m: ChannelMonitor) {
   form.primary_model = m.primary_model
   form.extra_models = [...(m.extra_models || [])]
   form.group_name = m.group_name || ''
-  form.interval_seconds = m.interval_seconds || DEFAULT_INTERVAL_SECONDS
+  form.interval_seconds = m.interval_seconds || systemDefaultInterval.value
   form.enabled = m.enabled
 }
 

frontend/src/i18n/locales/en.ts

@@ -4530,6 +4530,7 @@ export default {
       description: 'Manage registration, email verification, default values, and SMTP settings',
       tabs: {
         general: 'General',
+        features: 'Feature Switches',
         security: 'Security',
         users: 'Users',
         gateway: 'Gateway',
@@ -4537,6 +4538,16 @@ export default {
         backup: 'Backup',
         payment: 'Payment',
       },
+      features: {
+        channelMonitor: {
+          title: 'Channel Monitor',
+          description: 'Periodically probe configured channels and surface availability / latency to users. Turning it off stops the scheduler and returns an empty list on the user page.',
+          enabled: 'Enable Channel Monitor',
+          enabledHint: 'Disabling stops background checks; existing history is preserved.',
+          defaultInterval: 'Default check interval (seconds)',
+          defaultIntervalHint: 'Pre-fills the interval when creating a new monitor; each monitor can override it. Range 15 – 3600.',
+        },
+      },
       emailTabDisabledTitle: 'Email Verification Not Enabled',
       emailTabDisabledHint: 'Enable email verification in the Security tab to configure SMTP settings.',
       registration: {

frontend/src/i18n/locales/zh.ts

@@ -4695,6 +4695,7 @@ export default {
       description: '管理注册、邮箱验证、默认值和 SMTP 设置',
       tabs: {
         general: '通用设置',
+        features: '功能开关',
         security: '安全与认证',
         users: '用户默认值',
         gateway: '网关服务',
@@ -4702,6 +4703,16 @@ export default {
         backup: '数据备份',
         payment: '支付设置',
       },
+      features: {
+        channelMonitor: {
+          title: '渠道监控',
+          description: '定期对配置的渠道发起健康检查，向用户展示可用性与延迟。关闭后调度器停止扫描，用户端列表为空。',
+          enabled: '启用渠道监控',
+          enabledHint: '关闭后后台不再执行定时检测，已有数据保留。',
+          defaultInterval: '默认检测间隔（秒）',
+          defaultIntervalHint: '新建渠道监控时表单的默认值，可被单个渠道覆盖。范围 15 – 3600 秒。',
+        },
+      },
       emailTabDisabledTitle: '邮箱验证未启用',
       emailTabDisabledHint: '请在「安全与认证」选项卡中启用邮箱验证后，再配置 SMTP 设置。',
       registration: {

frontend/src/stores/app.ts

@@ -352,6 +352,8 @@ export const useAppStore = defineStore('app', () => {
         balance_low_notify_enabled: false,
         account_quota_notify_enabled: false,
         balance_low_notify_threshold: 0,
+        channel_monitor_enabled: true,
+        channel_monitor_default_interval_seconds: 60,
       }
     }
 

frontend/src/types/index.ts

@@ -185,6 +185,8 @@ export interface PublicSettings {
   balance_low_notify_enabled: boolean
   account_quota_notify_enabled: boolean
   balance_low_notify_threshold: number
+  channel_monitor_enabled: boolean
+  channel_monitor_default_interval_seconds: number
 }
 
 export interface AuthResponse {

frontend/src/views/admin/SettingsView.vue

@@ -3749,6 +3749,52 @@
         </div>
         <!-- /Tab: General -->
 
+        <!-- Tab: Features (功能开关) -->
+        <div v-show="activeTab === 'features'" class="space-y-6">
+
+        <div class="card">
+          <div class="border-b border-gray-100 px-6 py-4 dark:border-dark-700">
+            <h2 class="text-lg font-semibold text-gray-900 dark:text-white">
+              {{ t('admin.settings.features.channelMonitor.title') }}
+            </h2>
+            <p class="mt-1 text-sm text-gray-500 dark:text-gray-400">
+              {{ t('admin.settings.features.channelMonitor.description') }}
+            </p>
+          </div>
+          <div class="space-y-5 p-6">
+            <div class="flex items-center justify-between">
+              <div>
+                <label class="text-sm font-medium text-gray-700 dark:text-gray-300">
+                  {{ t('admin.settings.features.channelMonitor.enabled') }}
+                </label>
+                <p class="mt-0.5 text-xs text-gray-500 dark:text-gray-400">
+                  {{ t('admin.settings.features.channelMonitor.enabledHint') }}
+                </p>
+              </div>
+              <Toggle v-model="form.channel_monitor_enabled" />
+            </div>
+
+            <div v-if="form.channel_monitor_enabled">
+              <label class="input-label">
+                {{ t('admin.settings.features.channelMonitor.defaultInterval') }}
+                <span class="text-red-500">*</span>
+              </label>
+              <input
+                v-model.number="form.channel_monitor_default_interval_seconds"
+                type="number"
+                min="15"
+                max="3600"
+                class="input"
+              />
+              <p class="mt-1 text-xs text-gray-400">
+                {{ t('admin.settings.features.channelMonitor.defaultIntervalHint') }}
+              </p>
+            </div>
+          </div>
+        </div>
+
+        </div><!-- /Tab: Features -->
+
         <!-- Tab: Email -->
         <!-- Tab: Payment -->
         <div v-show="activeTab === 'payment'" class="space-y-6">
@@ -4737,6 +4783,7 @@ const paymentMethodsHref = computed(() =>
 
 type SettingsTab =
   | "general"
+  | "features"
   | "security"
   | "users"
   | "gateway"
@@ -4746,6 +4793,7 @@ type SettingsTab =
 const activeTab = ref<SettingsTab>("general");
 const settingsTabs = [
   { key: "general" as SettingsTab, icon: "home" as const },
+  { key: "features" as SettingsTab, icon: "bolt" as const },
   { key: "security" as SettingsTab, icon: "shield" as const },
   { key: "users" as SettingsTab, icon: "user" as const },
   { key: "gateway" as SettingsTab, icon: "server" as const },
@@ -5005,6 +5053,9 @@ const form = reactive<SettingsForm>({
   balance_low_notify_recharge_url: "",
   account_quota_notify_enabled: false,
   account_quota_notify_emails: [] as NotifyEmailEntry[],
+  // Channel Monitor feature switch
+  channel_monitor_enabled: true,
+  channel_monitor_default_interval_seconds: 60,
 });
 
 const authSourceDefaults = reactive<AuthSourceDefaultsState>(
@@ -5912,6 +5963,10 @@ async function saveSettings() {
       account_quota_notify_emails: (
         form.account_quota_notify_emails || []
       ).filter((e) => e.email.trim() !== ""),
+      // Channel Monitor feature switch
+      channel_monitor_enabled: form.channel_monitor_enabled,
+      channel_monitor_default_interval_seconds:
+        Number(form.channel_monitor_default_interval_seconds) || 60,
     };
 
     appendAuthSourceDefaultsToUpdateRequest(payload, authSourceDefaults);