fix(monitor-ui): localize the "quota" placeholder model across monitor views

纯配额模式的主模型存储值是占位符 "quota"（数据源是关联账号而非模型），
此前在管理列表主模型列、用户端监控卡片、用户端详情弹窗、运行结果弹窗
四处被当作真实模型名直接渲染，读起来像假模型。

新增 useChannelMonitorFormat.formatMonitorModel：占位符替换为本地化
「配额」标签（复用既有 monitorCommon.checkMode.quota，零新增 i18n 键），
quota_probe/probe 的真实模型名不受影响；纯匹配逻辑（如 15d/30d 可用率
按模型名回查 detail）仍用原始值。

问题定位备注：另一反馈「设置页看不到 channel_monitor_show_quota 开关」
经查为部署镜像过旧（开关随 #5761 于 08-18 合入，反馈环境容器构建于
08-15），上游代码中开关完整存在，更新镜像即可，无需改码。

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

@@ -1,7 +1,8 @@
 <template>
   <div class="flex flex-col gap-0.5">
     <div class="flex items-center gap-2">
-      <span class="text-sm text-gray-900 dark:text-gray-100">{{ row.primary_model }}</span>
+      <!-- 纯配额模式主模型是占位符 "quota"（数据源是账号不是模型），展示层替换为本地化标签 -->
+      <span class="text-sm text-gray-900 dark:text-gray-100">{{ formatMonitorModel(row.primary_model) }}</span>
       <HelpTooltip>
       <template #trigger>
         <span
@@ -13,7 +14,7 @@
       </template>
       <div class="space-y-2">
         <div class="text-xs font-semibold text-gray-100">
-          {{ row.primary_model }}
+          {{ formatMonitorModel(row.primary_model) }}
           <span
             class="ml-1 inline-flex items-center rounded-full px-1.5 py-0.5 text-[10px] font-medium"
             :class="statusBadgeClass(row.primary_status)"
@@ -72,5 +73,5 @@ defineProps<{
 }>()
 
 const { t } = useI18n()
-const { statusLabel, statusBadgeClass, formatLatency } = useChannelMonitorFormat()
+const { statusLabel, statusBadgeClass, formatLatency, formatMonitorModel } = useChannelMonitorFormat()
 </script>

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

@@ -12,7 +12,7 @@
         class="flex items-center justify-between rounded-lg border border-gray-200 px-3 py-2 text-sm dark:border-dark-600"
       >
         <div class="flex flex-col">
-          <span class="font-medium text-gray-900 dark:text-white">{{ r.model }}</span>
+          <span class="font-medium text-gray-900 dark:text-white">{{ formatMonitorModel(r.model) }}</span>
           <span v-if="r.message" class="text-xs text-gray-500 dark:text-gray-400">{{ r.message }}</span>
           <MonitorQuotaView :snapshot="r.quota" class="mt-1" />
         </div>
@@ -54,5 +54,5 @@ defineEmits<{
 }>()
 
 const { t } = useI18n()
-const { statusLabel, statusBadgeClass, formatLatency } = useChannelMonitorFormat()
+const { statusLabel, statusBadgeClass, formatLatency, formatMonitorModel } = useChannelMonitorFormat()
 </script>

frontend/src/components/admin/monitor/__tests__/MonitorPrimaryModelCell.spec.ts

@@ -0,0 +1,73 @@
+import { mount } from '@vue/test-utils'
+import { describe, expect, it, vi } from 'vitest'
+
+import type { ChannelMonitor } from '@/api/admin/channelMonitor'
+import MonitorPrimaryModelCell from '../MonitorPrimaryModelCell.vue'
+
+// 占位符 "quota" 是纯配额模式主模型的存储值（数据源是账号不是模型），
+// 展示层必须替换为本地化标签，不得作为假模型名透出。
+
+vi.mock('vue-i18n', async () => {
+  const actual = await vi.importActual<typeof import('vue-i18n')>('vue-i18n')
+  return {
+    ...actual,
+    useI18n: () => ({ t: (key: string) => key }),
+  }
+})
+
+function makeRow(overrides: Partial<ChannelMonitor> = {}): ChannelMonitor {
+  return {
+    id: 1,
+    name: 'kimi-coding',
+    provider: 'kimi',
+    api_mode: 'chat_completions',
+    endpoint: '',
+    api_key_masked: '',
+    primary_model: 'quota',
+    extra_models: [],
+    group_name: '',
+    enabled: true,
+    interval_seconds: 60,
+    jitter_seconds: 0,
+    last_checked_at: null,
+    created_by: 1,
+    created_at: '2026-08-18T00:00:00Z',
+    updated_at: '2026-08-18T00:00:00Z',
+    primary_status: 'operational',
+    primary_latency_ms: null,
+    availability_7d: 100,
+    extra_models_status: [],
+    template_id: null,
+    extra_headers: {},
+    body_override_mode: 'off',
+    body_override: null,
+    check_mode: 'quota',
+    account_id: 5,
+    ...overrides,
+  }
+}
+
+function mountCell(row: ChannelMonitor) {
+  return mount(MonitorPrimaryModelCell, {
+    props: { row },
+    global: {
+      stubs: { MonitorQuotaView: true, HelpTooltip: false },
+    },
+  })
+}
+
+describe('MonitorPrimaryModelCell placeholder model display', () => {
+  it('replaces the quota placeholder with the localized mode label', () => {
+    const wrapper = mountCell(makeRow())
+    expect(wrapper.text()).toContain('monitorCommon.checkMode.quota')
+  })
+
+  it('keeps the real model for quota_probe and probe rows', () => {
+    const wrapper = mountCell(makeRow({
+      check_mode: 'quota_probe',
+      primary_model: 'claude-sonnet-4-5',
+    }))
+    expect(wrapper.text()).toContain('claude-sonnet-4-5')
+    expect(wrapper.text()).not.toContain('monitorCommon.checkMode.quota')
+  })
+})

frontend/src/components/user/MonitorDetailDialog.vue

@@ -30,7 +30,7 @@
             :key="m.model"
             class="border-b border-gray-100 dark:border-dark-800"
           >
-            <td class="py-2 pr-3 font-medium text-gray-900 dark:text-gray-100">{{ m.model }}</td>
+            <td class="py-2 pr-3 font-medium text-gray-900 dark:text-gray-100">{{ formatMonitorModel(m.model) }}</td>
             <td class="py-2 pr-3">
               <span
                 class="inline-flex items-center rounded-full px-2 py-0.5 text-[11px]"
@@ -83,7 +83,7 @@ defineEmits<{
 
 const { t } = useI18n()
 const appStore = useAppStore()
-const { statusLabel, statusBadgeClass, formatLatency, formatPercent } = useChannelMonitorFormat()
+const { statusLabel, statusBadgeClass, formatLatency, formatPercent, formatMonitorModel } = useChannelMonitorFormat()
 
 const detail = ref<UserMonitorDetail | null>(null)
 const loading = ref(false)

frontend/src/components/user/__tests__/MonitorCard.quota.spec.ts

@@ -88,4 +88,16 @@ describe('MonitorCard quota snapshot visibility', () => {
     const wrapper = mountCard(makeItem())
     expect(wrapper.find('[data-testid="monitor-quota-view"]').exists()).toBe(false)
   })
+
+  // 占位符 "quota" 是主模型存储值，不得作为假模型名直接透出到用户端。
+  it('shows the localized quota label instead of the raw placeholder model', () => {
+    const wrapper = mountCard(makeItem())
+    expect(wrapper.text()).toContain('monitorCommon.checkMode.quota')
+  })
+
+  it('keeps the real model name for probe monitors', () => {
+    const wrapper = mountCard(makeItem({ primary_model: 'claude-sonnet-4-5' }))
+    expect(wrapper.text()).toContain('claude-sonnet-4-5')
+    expect(wrapper.text()).not.toContain('monitorCommon.checkMode.quota')
+  })
 })

frontend/src/components/user/monitor/MonitorCard.vue

@@ -23,8 +23,9 @@
           >
             {{ providerLabel(item.provider) }}
           </span>
+          <!-- 纯配额模式主模型是占位符 "quota"，展示层替换为本地化「配额」标签 -->
           <span class="font-mono text-xs truncate text-gray-500 dark:text-gray-400">
-            {{ item.primary_model }}
+            {{ formatMonitorModel(item.primary_model) }}
           </span>
           <span
             v-if="item.group_name"
@@ -120,6 +121,7 @@ const {
   providerLabel,
   providerBadgeClass,
   formatLatency,
+  formatMonitorModel,
 } = useChannelMonitorFormat()
 
 const providerTintClass = computed(() =>

frontend/src/composables/useChannelMonitorFormat.ts

@@ -79,6 +79,21 @@ export function useChannelMonitorFormat() {
     return m || '-'
   }
 
+  /**
+   * Display label for a monitor's primary model. Pure-quota monitors carry the
+   * literal placeholder "quota" (the probe target is an account, not a model),
+   * which must not leak into the UI as a fake model name — render the
+   * localized mode label instead. quota_probe keeps a real model name.
+   */
+  const QUOTA_MODEL_PLACEHOLDER = 'quota'
+
+  function formatMonitorModel(model: string): string {
+    if (model === QUOTA_MODEL_PLACEHOLDER) {
+      return t('monitorCommon.checkMode.quota')
+    }
+    return model
+  }
+
   function providerBadgeClass(p: Provider | string): string {
     switch (p) {
       case PROVIDER_OPENAI:
@@ -200,6 +215,7 @@ export function useChannelMonitorFormat() {
     statusBadgeClass,
     providerLabel,
     checkModeLabel,
+    formatMonitorModel,
     providerBadgeClass,
     checkModeBadgeClass,
     providerPickerClass,