refactor(ui): extract formatCacheTokens and formatMultiplier to shared utils

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

@@ -326,6 +326,7 @@
 import { ref } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { formatDateTime, formatReasoningEffort } from '@/utils/format'
+import { formatCacheTokens, formatMultiplier } from '@/utils/formatters'
 import { formatTokenPricePerMillion } from '@/utils/usagePricing'
 import { getUsageServiceTierLabel } from '@/utils/usageServiceTier'
 import { resolveUsageRequestType } from '@/utils/usageRequestType'
@@ -376,19 +377,6 @@ const getBillingModeBadgeClass = (mode: string | null | undefined): string => {
   return 'bg-gray-100 text-gray-800 dark:bg-gray-700 dark:text-gray-200'
 }
 
-const formatCacheTokens = (tokens: number): string => {
-  if (tokens >= 1000000) return `${(tokens / 1000000).toFixed(1)}M`
-  if (tokens >= 1000) return `${(tokens / 1000).toFixed(1)}K`
-  return tokens.toString()
-}
-
-// 自适应精度：保留足够位数显示有效数字（如 0.001 → "0.001"，1.5 → "1.50"）
-const formatMultiplier = (val: number): string => {
-  if (val >= 0.01) return val.toFixed(2)
-  if (val >= 0.001) return val.toFixed(3)
-  if (val >= 0.0001) return val.toFixed(4)
-  return val.toPrecision(2)
-}
 
 const formatUserAgent = (ua: string): string => {
   return ua

frontend/src/utils/formatters.ts

+/**
+ * 格式化缓存 token 数量（1K/1M 缩写）
+ */
+export function formatCacheTokens(tokens: number): string {
+  if (tokens >= 1000000) return `${(tokens / 1000000).toFixed(1)}M`
+  if (tokens >= 1000) return `${(tokens / 1000).toFixed(1)}K`
+  return tokens.toLocaleString()
+}
+
+/**
+ * 自适应精度格式化倍率（确保小数值如 0.001 不被截断）
+ */
+export function formatMultiplier(val: number): string {
+  if (val >= 0.01) return val.toFixed(2)
+  if (val >= 0.001) return val.toFixed(3)
+  if (val >= 0.0001) return val.toFixed(4)
+  return val.toPrecision(2)
+}

frontend/src/views/user/UsageView.vue

@@ -504,6 +504,7 @@ import type { UsageLog, ApiKey, UsageQueryParams, UsageStatsResponse } from '@/t
 import type { Column } from '@/components/common/types'
 import { formatDateTime, formatReasoningEffort } from '@/utils/format'
 import { getPersistedPageSize } from '@/composables/usePersistedPageSize'
+import { formatCacheTokens, formatMultiplier } from '@/utils/formatters'
 import { formatTokenPricePerMillion } from '@/utils/usagePricing'
 import { getUsageServiceTierLabel } from '@/utils/usageServiceTier'
 import { resolveUsageRequestType } from '@/utils/usageRequestType'
@@ -659,22 +660,6 @@ const formatTokens = (value: number): string => {
   return value.toLocaleString()
 }
 
-// Compact format for cache tokens in table cells
-const formatCacheTokens = (value: number): string => {
-  if (value >= 1_000_000) {
-    return `${(value / 1_000_000).toFixed(1)}M`
-  } else if (value >= 1_000) {
-    return `${(value / 1_000).toFixed(1)}K`
-  }
-  return value.toLocaleString()
-}
-
-const formatMultiplier = (val: number): string => {
-  if (val >= 0.01) return val.toFixed(2)
-  if (val >= 0.001) return val.toFixed(3)
-  if (val >= 0.0001) return val.toFixed(4)
-  return val.toPrecision(2)
-}
 
 const loadUsageLogs = async () => {
   if (abortController) {