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/common/Pagination.vue

@@ -63,13 +63,7 @@
           class="relative inline-flex items-center rounded-l-md border border-gray-300 bg-white px-2 py-2 text-sm font-medium text-gray-500 hover:bg-gray-50 disabled:cursor-not-allowed disabled:opacity-50 dark:border-dark-600 dark:bg-dark-700 dark:text-gray-400 dark:hover:bg-dark-600"
           :aria-label="t('pagination.previous')"
         >
-          <svg class="h-5 w-5" fill="currentColor" viewBox="0 0 20 20">
-            <path
-              fill-rule="evenodd"
-              d="M12.707 5.293a1 1 0 010 1.414L9.414 10l3.293 3.293a1 1 0 01-1.414 1.414l-4-4a1 1 0 010-1.414l4-4a1 1 0 011.414 0z"
-              clip-rule="evenodd"
-            />
-          </svg>
+          <Icon name="chevronLeft" size="md" />
         </button>
 
         <!-- Page numbers -->
@@ -100,13 +94,7 @@
           class="relative inline-flex items-center rounded-r-md border border-gray-300 bg-white px-2 py-2 text-sm font-medium text-gray-500 hover:bg-gray-50 disabled:cursor-not-allowed disabled:opacity-50 dark:border-dark-600 dark:bg-dark-700 dark:text-gray-400 dark:hover:bg-dark-600"
           :aria-label="t('pagination.next')"
         >
-          <svg class="h-5 w-5" fill="currentColor" viewBox="0 0 20 20">
-            <path
-              fill-rule="evenodd"
-              d="M7.293 14.707a1 1 0 010-1.414L10.586 10 7.293 6.707a1 1 0 011.414-1.414l4 4a1 1 0 010 1.414l-4 4a1 1 0 01-1.414 0z"
-              clip-rule="evenodd"
-            />
-          </svg>
+          <Icon name="chevronRight" size="md" />
         </button>
       </nav>
     </div>
@@ -116,6 +104,7 @@
 <script setup lang="ts">
 import { computed } from 'vue'
 import { useI18n } from 'vue-i18n'
+import Icon from '@/components/icons/Icon.vue'
 import Select from './Select.vue'
 
 const { t } = useI18n()