refactor(frontend): 完成所有组件的内联SVG统一替换为Icon组件

- 扩展 Icon.vue 组件，新增 60+ 图标路径
  - 导航类: arrowRight, arrowLeft, arrowUp, arrowDown, chevronUp, externalLink
  - 状态类: checkCircle, xCircle, exclamationCircle, exclamationTriangle, infoCircle
  - 用户类: user, userCircle, userPlus, users
  - 文档类: document, clipboard, copy, inbox
  - 操作类: download, upload, filter, sort
  - 安全类: key, lock, shield
  - UI类: menu, calendar, home, terminal, gift, creditCard, mail
  - 数据类: chartBar, trendingUp, database, cube
  - 其他: bolt, sparkles, cloud, server, sun, moon, book 等

- 重构 56 个 Vue 组件，用 Icon 组件替换内联 SVG
  - 净减少约 2200 行代码
  - 提升代码可维护性和一致性
  - 统一图标样式和尺寸管理

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

@@ -1,7 +1,9 @@
 <template>
   <div class="grid grid-cols-2 gap-4 lg:grid-cols-4">
     <div class="card p-4 flex items-center gap-3">
-      <div class="rounded-lg bg-blue-100 p-2 dark:bg-blue-900/30 text-blue-600"><svg class="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" /></svg></div>
+      <div class="rounded-lg bg-blue-100 p-2 dark:bg-blue-900/30 text-blue-600">
+        <Icon name="document" size="md" />
+      </div>
       <div><p class="text-xs font-medium text-gray-500">{{ t('usage.totalRequests') }}</p><p class="text-xl font-bold">{{ stats?.total_requests?.toLocaleString() || '0' }}</p></div>
     </div>
     <div class="card p-4 flex items-center gap-3">
@@ -9,19 +11,36 @@
       <div><p class="text-xs font-medium text-gray-500">{{ t('usage.totalTokens') }}</p><p class="text-xl font-bold">{{ formatTokens(stats?.total_tokens || 0) }}</p></div>
     </div>
     <div class="card p-4 flex items-center gap-3">
-      <div class="rounded-lg bg-green-100 p-2 dark:bg-green-900/30 text-green-600"><svg class="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8c-1.657 0-3 .895-3 2s1.343 2 3 2 3 .895 3 2-1.343 2-3 2m0-8c1.11 0 2.08.402 2.599 1M12 8V7m0 1v8m0 0v1m0-1c-1.11 0-2.08-.402-2.599-1M21 12a9 9 0 11-18 0 9 9 0 0118 0z" /></svg></div>
+      <div class="rounded-lg bg-green-100 p-2 dark:bg-green-900/30 text-green-600">
+        <Icon name="dollar" size="md" />
+      </div>
       <div><p class="text-xs font-medium text-gray-500">{{ t('usage.totalCost') }}</p><p class="text-xl font-bold text-green-600">${{ (stats?.total_actual_cost || 0).toFixed(4) }}</p></div>
     </div>
     <div class="card p-4 flex items-center gap-3">
-      <div class="rounded-lg bg-purple-100 p-2 dark:bg-purple-900/30 text-purple-600"><svg class="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 6v6h4.5m4.5 0a9 9 0 11-18 0 9 9 0 0118 0z" /></svg></div>
+      <div class="rounded-lg bg-purple-100 p-2 dark:bg-purple-900/30 text-purple-600">
+        <Icon name="clock" size="md" />
+      </div>
       <div><p class="text-xs font-medium text-gray-500">{{ t('usage.avgDuration') }}</p><p class="text-xl font-bold">{{ formatDuration(stats?.average_duration_ms || 0) }}</p></div>
     </div>
   </div>
 </template>
 
 <script setup lang="ts">
-import { useI18n } from 'vue-i18n'; import type { AdminUsageStatsResponse } from '@/api/admin/usage'
-defineProps<{ stats: AdminUsageStatsResponse | null }>(); const { t } = useI18n()
-const formatDuration = (ms: number) => ms < 1000 ? `${ms.toFixed(0)}ms` : `${(ms/1000).toFixed(2)}s`
-const formatTokens = (v: number) => { if (v >= 1e9) return (v/1e9).toFixed(2) + 'B'; if (v >= 1e6) return (v/1e6).toFixed(2) + 'M'; if (v >= 1e3) return (v/1e3).toFixed(2) + 'K'; return v.toLocaleString() }
-</script>
+import { useI18n } from 'vue-i18n'
+import type { AdminUsageStatsResponse } from '@/api/admin/usage'
+import Icon from '@/components/icons/Icon.vue'
+
+defineProps<{ stats: AdminUsageStatsResponse | null }>()
+
+const { t } = useI18n()
+
+const formatDuration = (ms: number) =>
+  ms < 1000 ? `${ms.toFixed(0)}ms` : `${(ms / 1000).toFixed(2)}s`
+
+const formatTokens = (value: number) => {
+  if (value >= 1e9) return (value / 1e9).toFixed(2) + 'B'
+  if (value >= 1e6) return (value / 1e6).toFixed(2) + 'M'
+  if (value >= 1e3) return (value / 1e3).toFixed(2) + 'K'
+  return value.toLocaleString()
+}
+</script>

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

@@ -38,11 +38,11 @@
           <div class="space-y-1 text-sm">
             <div class="flex items-center gap-2">
               <div class="inline-flex items-center gap-1">
-                <svg class="h-3.5 w-3.5 text-emerald-500" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 14l-7 7m0 0l-7-7m7 7V3" /></svg>
+                <Icon name="arrowDown" size="sm" class="h-3.5 w-3.5 text-emerald-500" />
                 <span class="font-medium text-gray-900 dark:text-white">{{ row.input_tokens?.toLocaleString() || 0 }}</span>
               </div>
               <div class="inline-flex items-center gap-1">
-                <svg class="h-3.5 w-3.5 text-violet-500" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 10l7-7m0 0l7 7m-7-7v18" /></svg>
+                <Icon name="arrowUp" size="sm" class="h-3.5 w-3.5 text-violet-500" />
                 <span class="font-medium text-gray-900 dark:text-white">{{ row.output_tokens?.toLocaleString() || 0 }}</span>
               </div>
             </div>
@@ -87,7 +87,7 @@
             <span class="font-mono text-xs text-gray-500 dark:text-gray-400 truncate" :title="row.request_id">{{ row.request_id }}</span>
             <button @click="copyRequestId(row.request_id)" class="flex-shrink-0 rounded p-0.5 transition-colors hover:bg-gray-100 dark:hover:bg-dark-700" :class="copiedRequestId === row.request_id ? 'text-green-500' : 'text-gray-400 hover:text-gray-600 dark:hover:text-gray-300'" :title="copiedRequestId === row.request_id ? t('keys.copied') : t('keys.copyToClipboard')">
               <svg v-if="copiedRequestId === row.request_id" class="h-3.5 w-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="2"><path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7" /></svg>
-              <svg v-else class="h-3.5 w-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="2"><path stroke-linecap="round" stroke-linejoin="round" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z" /></svg>
+              <Icon v-else name="copy" size="sm" class="h-3.5 w-3.5" />
             </button>
           </div>
           <span v-else class="text-gray-400 dark:text-gray-500">-</span>
@@ -106,6 +106,7 @@ import { formatDateTime } from '@/utils/format'
 import { useAppStore } from '@/stores/app'
 import DataTable from '@/components/common/DataTable.vue'
 import EmptyState from '@/components/common/EmptyState.vue'
+import Icon from '@/components/icons/Icon.vue'
 
 defineProps(['data', 'loading'])
 const { t } = useI18n()