fix(usage): 修复缓存创建 token 展示并在总量中计入缓存组件

- gateway/admin 用量载荷在 cache_creation_input_tokens 为 0 时回填 ephemeral_5m/1h 合计
- 标准化用量写入时将 cache_creation/cache_read token 计入 total_tokens
- 前端列表与轮询同步新增分类字段，修复缓存 token 列显示

frontend/src/features/usage/components/UsageRecordsTable.vue

@@ -557,9 +557,9 @@
                 <span>{{ formatTokens(record.output_tokens || 0) }}</span>
               </div>
               <div class="flex items-center gap-1 text-muted-foreground">
-                <span :class="record.cache_creation_input_tokens ? 'text-foreground/70' : ''">{{ record.cache_creation_input_tokens ? formatTokens(record.cache_creation_input_tokens) : '-' }}</span>
+                <span :class="hasPositiveTokens(getRecordCacheCreationTokens(record)) ? 'text-foreground/70' : ''">{{ formatOptionalTokens(getRecordCacheCreationTokens(record)) }}</span>
                 <span>/</span>
-                <span :class="record.cache_read_input_tokens ? 'text-foreground/70' : ''">{{ record.cache_read_input_tokens ? formatTokens(record.cache_read_input_tokens) : '-' }}</span>
+                <span :class="hasPositiveTokens(record.cache_read_input_tokens) ? 'text-foreground/70' : ''">{{ formatOptionalTokens(record.cache_read_input_tokens) }}</span>
               </div>
             </div>
           </TableCell>
@@ -677,7 +677,7 @@ import {
 import { RefreshCcw, Search } from 'lucide-vue-next'
 import { formatTokens, formatCurrency } from '@/utils/format'
 import { formatDateTime } from '../composables'
-import { getEffectiveInputTokens } from '../token-normalization'
+import { getCacheCreationTokens, getEffectiveInputTokens } from '../token-normalization'
 import { isUsageRecordFailed, resolveDisplayRequestStatus } from '../utils/status'
 import { useRowClick } from '@/composables/useRowClick'
 import { formatApiFormat } from '@/api/endpoints/types/api-format'
@@ -787,6 +787,18 @@ function getRecordEffectiveInputTokens(record: UsageRecord): number {
   return getEffectiveInputTokens(record)
 }
 
+function getRecordCacheCreationTokens(record: UsageRecord): number {
+  return getCacheCreationTokens(record)
+}
+
+function hasPositiveTokens(value: number | null | undefined): boolean {
+  return typeof value === 'number' && Number.isFinite(value) && value > 0
+}
+
+function formatOptionalTokens(value: number | null | undefined): string {
+  return hasPositiveTokens(value) ? formatTokens(value) : '-'
+}
+
 // useDebounceFn 自动处理清理，无需 onUnmounted
 
 // 判断是否应该显示格式转换信息