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/user/dashboard/UserDashboardQuickActions.vue

@@ -6,47 +6,47 @@
     <div class="space-y-3 p-4">
       <button @click="router.push('/keys')" class="group flex w-full items-center gap-4 rounded-xl bg-gray-50 p-4 text-left transition-all duration-200 hover:bg-gray-100 dark:bg-dark-800/50 dark:hover:bg-dark-800">
         <div class="flex h-12 w-12 flex-shrink-0 items-center justify-center rounded-xl bg-primary-100 transition-transform group-hover:scale-105 dark:bg-primary-900/30">
-          <svg class="h-6 w-6 text-primary-600 dark:text-primary-400" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5">
-            <path stroke-linecap="round" stroke-linejoin="round" d="M15.75 5.25a3 3 0 013 3m3 0a6 6 0 01-7.029 5.912c-.563-.097-1.159.026-1.563.43L10.5 17.25H8.25v2.25H6v2.25H2.25v-2.818c0-.597.237-1.17.659-1.591l6.499-6.499c.404-.404.527-1 .43-1.563A6 6 0 1121.75 8.25z" />
-          </svg>
+          <Icon name="key" size="lg" class="text-primary-600 dark:text-primary-400" />
         </div>
         <div class="min-w-0 flex-1">
           <p class="text-sm font-medium text-gray-900 dark:text-white">{{ t('dashboard.createApiKey') }}</p>
           <p class="text-xs text-gray-500 dark:text-dark-400">{{ t('dashboard.generateNewKey') }}</p>
         </div>
-        <svg class="h-5 w-5 text-gray-400 transition-colors group-hover:text-primary-500 dark:text-dark-500" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5">
-          <path stroke-linecap="round" stroke-linejoin="round" d="M8.25 4.5l7.5 7.5-7.5 7.5" />
-        </svg>
+        <Icon
+          name="chevronRight"
+          size="md"
+          class="text-gray-400 transition-colors group-hover:text-primary-500 dark:text-dark-500"
+        />
       </button>
 
       <button @click="router.push('/usage')" class="group flex w-full items-center gap-4 rounded-xl bg-gray-50 p-4 text-left transition-all duration-200 hover:bg-gray-100 dark:bg-dark-800/50 dark:hover:bg-dark-800">
         <div class="flex h-12 w-12 flex-shrink-0 items-center justify-center rounded-xl bg-emerald-100 transition-transform group-hover:scale-105 dark:bg-emerald-900/30">
-          <svg class="h-6 w-6 text-emerald-600 dark:text-emerald-400" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5">
-            <path stroke-linecap="round" stroke-linejoin="round" d="M3 13.125C3 12.504 3.504 12 4.125 12h2.25c.621 0 1.125.504 1.125 1.125v6.75C7.5 20.496 6.996 21 6.375 21h-2.25A1.125 1.125 0 013 19.875v-6.75zM9.75 8.625c0-.621.504-1.125 1.125-1.125h2.25c.621 0 1.125.504 1.125 1.125v11.25c0 .621-.504 1.125-1.125 1.125h-2.25a1.125 1.125 0 01-1.125-1.125V8.625zM16.5 4.125c0-.621.504-1.125 1.125-1.125h2.25C20.496 3 21 3.504 21 4.125v15.75c0 .621-.504 1.125-1.125 1.125h-2.25a1.125 1.125 0 01-1.125-1.125V4.125z" />
-          </svg>
+          <Icon name="chart" size="lg" class="text-emerald-600 dark:text-emerald-400" />
         </div>
         <div class="min-w-0 flex-1">
           <p class="text-sm font-medium text-gray-900 dark:text-white">{{ t('dashboard.viewUsage') }}</p>
           <p class="text-xs text-gray-500 dark:text-dark-400">{{ t('dashboard.checkDetailedLogs') }}</p>
         </div>
-        <svg class="h-5 w-5 text-gray-400 transition-colors group-hover:text-emerald-500 dark:text-dark-500" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5">
-          <path stroke-linecap="round" stroke-linejoin="round" d="M8.25 4.5l7.5 7.5-7.5 7.5" />
-        </svg>
+        <Icon
+          name="chevronRight"
+          size="md"
+          class="text-gray-400 transition-colors group-hover:text-emerald-500 dark:text-dark-500"
+        />
       </button>
 
       <button @click="router.push('/redeem')" class="group flex w-full items-center gap-4 rounded-xl bg-gray-50 p-4 text-left transition-all duration-200 hover:bg-gray-100 dark:bg-dark-800/50 dark:hover:bg-dark-800">
         <div class="flex h-12 w-12 flex-shrink-0 items-center justify-center rounded-xl bg-amber-100 transition-transform group-hover:scale-105 dark:bg-amber-900/30">
-          <svg class="h-6 w-6 text-amber-600 dark:text-amber-400" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5">
-            <path stroke-linecap="round" stroke-linejoin="round" d="M21 11.25v8.25a1.5 1.5 0 01-1.5 1.5H5.25a1.5 1.5 0 01-1.5-1.5v-8.25M12 4.875A2.625 2.625 0 109.375 7.5H12m0-2.625V7.5m0-2.625A2.625 2.625 0 1114.625 7.5H12m0 0V21m-8.625-9.75h18c.621 0 1.125-.504 1.125-1.125v-1.5c0-.621-.504-1.125-1.125-1.125h-18c-.621 0-1.125.504-1.125 1.125v1.5c0 .621.504 1.125 1.125 1.125z" />
-          </svg>
+          <Icon name="gift" size="lg" class="text-amber-600 dark:text-amber-400" />
         </div>
         <div class="min-w-0 flex-1">
           <p class="text-sm font-medium text-gray-900 dark:text-white">{{ t('dashboard.redeemCode') }}</p>
           <p class="text-xs text-gray-500 dark:text-dark-400">{{ t('dashboard.addBalance') }}</p>
         </div>
-        <svg class="h-5 w-5 text-gray-400 transition-colors group-hover:text-amber-500 dark:text-dark-500" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5">
-          <path stroke-linecap="round" stroke-linejoin="round" d="M8.25 4.5l7.5 7.5-7.5 7.5" />
-        </svg>
+        <Icon
+          name="chevronRight"
+          size="md"
+          class="text-gray-400 transition-colors group-hover:text-amber-500 dark:text-dark-500"
+        />
       </button>
     </div>
   </div>
@@ -55,6 +55,7 @@
 <script setup lang="ts">
 import { useRouter } from 'vue-router'
 import { useI18n } from 'vue-i18n'
+import Icon from '@/components/icons/Icon.vue'
 const router = useRouter()
 const { t } = useI18n()
-</script>
+</script>