fix(admin/usage): 恢复成本 Tooltip 明细并优化账号筛选

问题修复:
- 恢复 Cost Tooltip 的成本分项明细 (input_cost, output_cost, cache 成本)
- 修复 Token Tooltip 双分隔线显示问题
- 修复 Tooltip 翻译键缺失问题，新增 costDetails/tokenDetails
- 恢复 Excel 导出格式化 (aoa_to_sheet + 翻译列头)

功能优化:
- 账号筛选从前端搜索改为后端搜索，避免一次加载 1000 条数据
- 行为与用户/API Key 筛选保持一致 (debounce + 后端分页)

frontend/src/components/admin/usage/UsageFilters.vue

@@ -85,9 +85,40 @@
         </div>
 
         <!-- Account Filter -->
-        <div class="w-full sm:w-auto sm:min-w-[220px]">
+        <div ref="accountSearchRef" class="usage-filter-dropdown relative w-full sm:w-auto sm:min-w-[220px]">
           <label class="input-label">{{ t('admin.usage.account') }}</label>
-          <Select v-model="filters.account_id" :options="accountOptions" searchable @change="emitChange" />
+          <input
+            v-model="accountKeyword"
+            type="text"
+            class="input pr-8"
+            :placeholder="t('admin.usage.searchAccountPlaceholder')"
+            @input="debounceAccountSearch"
+            @focus="showAccountDropdown = true"
+          />
+          <button
+            v-if="filters.account_id"
+            type="button"
+            @click="clearAccount"
+            class="absolute right-2 top-9 text-gray-400"
+            aria-label="Clear account filter"
+          >
+            ✕
+          </button>
+          <div
+            v-if="showAccountDropdown && (accountResults.length > 0 || accountKeyword)"
+            class="absolute z-50 mt-1 max-h-60 w-full overflow-auto rounded-lg border bg-white shadow-lg dark:bg-gray-800"
+          >
+            <button
+              v-for="a in accountResults"
+              :key="a.id"
+              type="button"
+              @click="selectAccount(a)"
+              class="w-full px-4 py-2 text-left hover:bg-gray-100 dark:hover:bg-gray-700"
+            >
+              <span class="truncate">{{ a.name }}</span>
+              <span class="ml-2 text-xs text-gray-400">#{{ a.id }}</span>
+            </button>
+          </div>
         </div>
 
         <!-- Stream Type Filter -->
@@ -166,6 +197,7 @@ const filters = toRef(props, 'modelValue')
 
 const userSearchRef = ref<HTMLElement | null>(null)
 const apiKeySearchRef = ref<HTMLElement | null>(null)
+const accountSearchRef = ref<HTMLElement | null>(null)
 
 const userKeyword = ref('')
 const userResults = ref<SimpleUser[]>([])
@@ -177,9 +209,17 @@ const apiKeyResults = ref<SimpleApiKey[]>([])
 const showApiKeyDropdown = ref(false)
 let apiKeySearchTimeout: ReturnType<typeof setTimeout> | null = null
 
+interface SimpleAccount {
+  id: number
+  name: string
+}
+const accountKeyword = ref('')
+const accountResults = ref<SimpleAccount[]>([])
+const showAccountDropdown = ref(false)
+let accountSearchTimeout: ReturnType<typeof setTimeout> | null = null
+
 const modelOptions = ref<SelectOption[]>([{ value: null, label: t('admin.usage.allModels') }])
 const groupOptions = ref<SelectOption[]>([{ value: null, label: t('admin.usage.allGroups') }])
-const accountOptions = ref<SelectOption[]>([{ value: null, label: t('admin.usage.allAccounts') }])
 
 const streamTypeOptions = ref<SelectOption[]>([
   { value: null, label: t('admin.usage.allTypes') },
@@ -278,6 +318,37 @@ const onClearApiKey = () => {
   emitChange()
 }
 
+const debounceAccountSearch = () => {
+  if (accountSearchTimeout) clearTimeout(accountSearchTimeout)
+  accountSearchTimeout = setTimeout(async () => {
+    if (!accountKeyword.value) {
+      accountResults.value = []
+      return
+    }
+    try {
+      const res = await adminAPI.accounts.list(1, 20, { search: accountKeyword.value })
+      accountResults.value = res.items.map((a) => ({ id: a.id, name: a.name }))
+    } catch {
+      accountResults.value = []
+    }
+  }, 300)
+}
+
+const selectAccount = (a: SimpleAccount) => {
+  accountKeyword.value = a.name
+  showAccountDropdown.value = false
+  filters.value.account_id = a.id
+  emitChange()
+}
+
+const clearAccount = () => {
+  accountKeyword.value = ''
+  accountResults.value = []
+  showAccountDropdown.value = false
+  filters.value.account_id = undefined
+  emitChange()
+}
+
 const onApiKeyFocus = () => {
   showApiKeyDropdown.value = true
   // Trigger search if no results yet
@@ -292,9 +363,11 @@ const onDocumentClick = (e: MouseEvent) => {
 
   const clickedInsideUser = userSearchRef.value?.contains(target) ?? false
   const clickedInsideApiKey = apiKeySearchRef.value?.contains(target) ?? false
+  const clickedInsideAccount = accountSearchRef.value?.contains(target) ?? false
 
   if (!clickedInsideUser) showUserDropdown.value = false
   if (!clickedInsideApiKey) showApiKeyDropdown.value = false
+  if (!clickedInsideAccount) showAccountDropdown.value = false
 }
 
 watch(
@@ -333,20 +406,27 @@ watch(
   }
 )
 
+watch(
+  () => filters.value.account_id,
+  (accountId) => {
+    if (!accountId) {
+      accountKeyword.value = ''
+      accountResults.value = []
+    }
+  }
+)
+
 onMounted(async () => {
   document.addEventListener('click', onDocumentClick)
 
   try {
-    const [gs, ms, as] = await Promise.all([
+    const [gs, ms] = await Promise.all([
       adminAPI.groups.list(1, 1000),
-      adminAPI.dashboard.getModelStats({ start_date: props.startDate, end_date: props.endDate }),
-      adminAPI.accounts.list(1, 1000)
+      adminAPI.dashboard.getModelStats({ start_date: props.startDate, end_date: props.endDate })
     ])
 
     groupOptions.value.push(...gs.items.map((g: any) => ({ value: g.id, label: g.name })))
 
-    accountOptions.value.push(...as.items.map((a: any) => ({ value: a.id, label: a.name })))
-
     const uniqueModels = new Set<string>()
     ms.models?.forEach((s: any) => s.model && uniqueModels.add(s.model))
     modelOptions.value.push(

frontend/src/components/admin/usage/UsageTable.vue

@@ -143,8 +143,8 @@
     >
       <div class="whitespace-nowrap rounded-lg border border-gray-700 bg-gray-900 px-3 py-2.5 text-xs text-white shadow-xl dark:border-gray-600 dark:bg-gray-800">
         <div class="space-y-1.5">
-          <div class="mb-2 border-b border-gray-700 pb-1.5">
-            <div class="text-xs font-semibold text-gray-300 mb-1">Token {{ t('usage.details') }}</div>
+          <div>
+            <div class="text-xs font-semibold text-gray-300 mb-1">{{ t('usage.tokenDetails') }}</div>
             <div v-if="tokenTooltipData && tokenTooltipData.input_tokens > 0" class="flex items-center justify-between gap-4">
               <span class="text-gray-400">{{ t('admin.usage.inputTokens') }}</span>
               <span class="font-medium text-white">{{ tokenTooltipData.input_tokens.toLocaleString() }}</span>
@@ -184,6 +184,27 @@
     >
       <div class="whitespace-nowrap rounded-lg border border-gray-700 bg-gray-900 px-3 py-2.5 text-xs text-white shadow-xl dark:border-gray-600 dark:bg-gray-800">
         <div class="space-y-1.5">
+          <!-- Cost Breakdown -->
+          <div class="mb-2 border-b border-gray-700 pb-1.5">
+            <div class="text-xs font-semibold text-gray-300 mb-1">{{ t('usage.costDetails') }}</div>
+            <div v-if="tooltipData && tooltipData.input_cost > 0" class="flex items-center justify-between gap-4">
+              <span class="text-gray-400">{{ t('admin.usage.inputCost') }}</span>
+              <span class="font-medium text-white">${{ tooltipData.input_cost.toFixed(6) }}</span>
+            </div>
+            <div v-if="tooltipData && tooltipData.output_cost > 0" class="flex items-center justify-between gap-4">
+              <span class="text-gray-400">{{ t('admin.usage.outputCost') }}</span>
+              <span class="font-medium text-white">${{ tooltipData.output_cost.toFixed(6) }}</span>
+            </div>
+            <div v-if="tooltipData && tooltipData.cache_creation_cost > 0" class="flex items-center justify-between gap-4">
+              <span class="text-gray-400">{{ t('admin.usage.cacheCreationCost') }}</span>
+              <span class="font-medium text-white">${{ tooltipData.cache_creation_cost.toFixed(6) }}</span>
+            </div>
+            <div v-if="tooltipData && tooltipData.cache_read_cost > 0" class="flex items-center justify-between gap-4">
+              <span class="text-gray-400">{{ t('admin.usage.cacheReadCost') }}</span>
+              <span class="font-medium text-white">${{ tooltipData.cache_read_cost.toFixed(6) }}</span>
+            </div>
+          </div>
+          <!-- Rate and Summary -->
           <div class="flex items-center justify-between gap-6">
             <span class="text-gray-400">{{ t('usage.rate') }}</span>
             <span class="font-semibold text-blue-400">{{ (tooltipData?.rate_multiplier || 1).toFixed(2) }}x</span>

frontend/src/i18n/locales/en.ts

@@ -376,6 +376,8 @@ export default {
   usage: {
     title: 'Usage Records',
     description: 'View and analyze your API usage history',
+    costDetails: 'Cost Breakdown',
+    tokenDetails: 'Token Breakdown',
     totalRequests: 'Total Requests',
     totalTokens: 'Total Tokens',
     totalCost: 'Total Cost',
@@ -1691,6 +1693,7 @@ export default {
       userFilter: 'User',
       searchUserPlaceholder: 'Search user by email...',
       searchApiKeyPlaceholder: 'Search API key by name...',
+      searchAccountPlaceholder: 'Search account by name...',
       selectedUser: 'Selected',
       user: 'User',
       account: 'Account',

frontend/src/i18n/locales/zh.ts

@@ -373,6 +373,8 @@ export default {
   usage: {
     title: '使用记录',
     description: '查看和分析您的 API 使用历史',
+    costDetails: '成本明细',
+    tokenDetails: 'Token 明细',
     totalRequests: '总请求数',
     totalTokens: '总 Token',
     totalCost: '总消费',
@@ -1836,6 +1838,7 @@ export default {
       userFilter: '用户',
       searchUserPlaceholder: '按邮箱搜索用户...',
       searchApiKeyPlaceholder: '按名称搜索 API 密钥...',
+      searchAccountPlaceholder: '按名称搜索账号...',
       selectedUser: '已选择',
       user: '用户',
       account: '账户',

frontend/src/views/admin/UsageView.vue

@@ -85,11 +85,48 @@ const exportToExcel = async () => {
       if (all.length >= total || res.items.length < 100) break; p++
     }
     if(!c.signal.aborted) {
-      // 动态加载 xlsx，降低首屏包体并减少高危依赖的常驻暴露面。
       const XLSX = await import('xlsx')
-      const ws = XLSX.utils.json_to_sheet(all); const wb = XLSX.utils.book_new(); XLSX.utils.book_append_sheet(wb, ws, 'Usage')
-      saveAs(new Blob([XLSX.write(wb, { bookType: 'xlsx', type: 'array' })], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' }), `usage_${Date.now()}.xlsx`)
-      appStore.showSuccess('Export Success')
+      const headers = [
+        t('usage.time'), t('admin.usage.user'), t('usage.apiKeyFilter'),
+        t('admin.usage.account'), t('usage.model'), t('admin.usage.group'),
+        t('usage.type'),
+        t('admin.usage.inputTokens'), t('admin.usage.outputTokens'),
+        t('admin.usage.cacheReadTokens'), t('admin.usage.cacheCreationTokens'),
+        t('admin.usage.inputCost'), t('admin.usage.outputCost'),
+        t('admin.usage.cacheReadCost'), t('admin.usage.cacheCreationCost'),
+        t('usage.rate'), t('usage.original'), t('usage.billed'),
+        t('usage.billingType'), t('usage.firstToken'), t('usage.duration'),
+        t('admin.usage.requestId')
+      ]
+      const rows = all.map(log => [
+        log.created_at,
+        log.user?.email || '',
+        log.api_key?.name || '',
+        log.account?.name || '',
+        log.model,
+        log.group?.name || '',
+        log.stream ? t('usage.stream') : t('usage.sync'),
+        log.input_tokens,
+        log.output_tokens,
+        log.cache_read_tokens,
+        log.cache_creation_tokens,
+        log.input_cost?.toFixed(6) || '0.000000',
+        log.output_cost?.toFixed(6) || '0.000000',
+        log.cache_read_cost?.toFixed(6) || '0.000000',
+        log.cache_creation_cost?.toFixed(6) || '0.000000',
+        log.rate_multiplier?.toFixed(2) || '1.00',
+        log.total_cost?.toFixed(6) || '0.000000',
+        log.actual_cost?.toFixed(6) || '0.000000',
+        log.billing_type === 1 ? t('usage.subscription') : t('usage.balance'),
+        log.first_token_ms ?? '',
+        log.duration_ms,
+        log.request_id || ''
+      ])
+      const ws = XLSX.utils.aoa_to_sheet([headers, ...rows])
+      const wb = XLSX.utils.book_new()
+      XLSX.utils.book_append_sheet(wb, ws, 'Usage')
+      saveAs(new Blob([XLSX.write(wb, { bookType: 'xlsx', type: 'array' })], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' }), `usage_${filters.value.start_date}_to_${filters.value.end_date}.xlsx`)
+      appStore.showSuccess(t('usage.exportSuccess'))
     }
   } catch (error) { console.error('Failed to export:', error); appStore.showError('Export Failed') }
   finally { if(exportAbortController === c) { exportAbortController = null; exporting.value = false; exportProgress.show = false } }

frontend/src/views/user/UsageView.vue

@@ -342,8 +342,8 @@
       >
         <div class="space-y-1.5">
           <!-- Token Breakdown -->
-          <div class="mb-2 border-b border-gray-700 pb-1.5">
-            <div class="text-xs font-semibold text-gray-300 mb-1">Token 明细</div>
+          <div>
+            <div class="text-xs font-semibold text-gray-300 mb-1">{{ t('usage.tokenDetails') }}</div>
             <div v-if="tokenTooltipData && tokenTooltipData.input_tokens > 0" class="flex items-center justify-between gap-4">
               <span class="text-gray-400">{{ t('admin.usage.inputTokens') }}</span>
               <span class="font-medium text-white">{{ tokenTooltipData.input_tokens.toLocaleString() }}</span>
@@ -389,6 +389,27 @@
         class="whitespace-nowrap rounded-lg border border-gray-700 bg-gray-900 px-3 py-2.5 text-xs text-white shadow-xl dark:border-gray-600 dark:bg-gray-800"
       >
         <div class="space-y-1.5">
+          <!-- Cost Breakdown -->
+          <div class="mb-2 border-b border-gray-700 pb-1.5">
+            <div class="text-xs font-semibold text-gray-300 mb-1">{{ t('usage.costDetails') }}</div>
+            <div v-if="tooltipData && tooltipData.input_cost > 0" class="flex items-center justify-between gap-4">
+              <span class="text-gray-400">{{ t('admin.usage.inputCost') }}</span>
+              <span class="font-medium text-white">${{ tooltipData.input_cost.toFixed(6) }}</span>
+            </div>
+            <div v-if="tooltipData && tooltipData.output_cost > 0" class="flex items-center justify-between gap-4">
+              <span class="text-gray-400">{{ t('admin.usage.outputCost') }}</span>
+              <span class="font-medium text-white">${{ tooltipData.output_cost.toFixed(6) }}</span>
+            </div>
+            <div v-if="tooltipData && tooltipData.cache_creation_cost > 0" class="flex items-center justify-between gap-4">
+              <span class="text-gray-400">{{ t('admin.usage.cacheCreationCost') }}</span>
+              <span class="font-medium text-white">${{ tooltipData.cache_creation_cost.toFixed(6) }}</span>
+            </div>
+            <div v-if="tooltipData && tooltipData.cache_read_cost > 0" class="flex items-center justify-between gap-4">
+              <span class="text-gray-400">{{ t('admin.usage.cacheReadCost') }}</span>
+              <span class="font-medium text-white">${{ tooltipData.cache_read_cost.toFixed(6) }}</span>
+            </div>
+          </div>
+          <!-- Rate and Summary -->
           <div class="flex items-center justify-between gap-6">
             <span class="text-gray-400">{{ t('usage.rate') }}</span>
             <span class="font-semibold text-blue-400"