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/UserAttributesConfigModal.vue

@@ -7,9 +7,7 @@
           {{ t('admin.users.attributes.description') }}
         </p>
         <button @click="openCreateModal" class="btn btn-primary btn-sm">
-          <svg class="mr-1.5 h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
-            <path stroke-linecap="round" stroke-linejoin="round" d="M12 4.5v15m7.5-7.5h-15" />
-          </svg>
+          <Icon name="plus" size="sm" class="mr-1.5" :stroke-width="2" />
           {{ t('admin.users.attributes.addAttribute') }}
         </button>
       </div>
@@ -45,9 +43,7 @@
         >
           <!-- Drag Handle -->
           <div class="cursor-move text-gray-400 hover:text-gray-600 dark:hover:text-gray-300" :title="t('admin.users.attributes.dragToReorder')">
-            <svg class="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5">
-              <path stroke-linecap="round" stroke-linejoin="round" d="M3.75 6.75h16.5M3.75 12h16.5m-16.5 5.25h16.5" />
-            </svg>
+            <Icon name="menu" size="md" />
           </div>
 
           <!-- Attribute Info -->
@@ -77,18 +73,14 @@
               class="rounded-lg p-1.5 text-gray-500 hover:bg-gray-100 hover:text-primary-600 dark:hover:bg-dark-700 dark:hover:text-primary-400"
               :title="t('common.edit')"
             >
-              <svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5">
-                <path stroke-linecap="round" stroke-linejoin="round" d="M16.862 4.487l1.687-1.688a1.875 1.875 0 112.652 2.652L10.582 16.07a4.5 4.5 0 01-1.897 1.13L6 18l.8-2.685a4.5 4.5 0 011.13-1.897l8.932-8.931zm0 0L19.5 7.125M18 14v4.75A2.25 2.25 0 0115.75 21H5.25A2.25 2.25 0 013 18.75V8.25A2.25 2.25 0 015.25 6H10" />
-              </svg>
+              <Icon name="edit" size="sm" />
             </button>
             <button
               @click="confirmDelete(attr)"
               class="rounded-lg p-1.5 text-gray-500 hover:bg-red-50 hover:text-red-600 dark:hover:bg-red-900/20 dark:hover:text-red-400"
               :title="t('common.delete')"
             >
-              <svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5">
-                <path stroke-linecap="round" stroke-linejoin="round" d="M14.74 9l-.346 9m-4.788 0L9.26 9m9.968-3.21c.342.052.682.107 1.022.166m-1.022-.165L18.16 19.673a2.25 2.25 0 01-2.244 2.077H8.084a2.25 2.25 0 01-2.244-2.077L4.772 5.79m14.456 0a48.108 48.108 0 00-3.478-.397m-12 .562c.34-.059.68-.114 1.022-.165m0 0a48.11 48.11 0 013.478-.397m7.5 0v-.916c0-1.18-.91-2.164-2.09-2.201a51.964 51.964 0 00-3.32 0c-1.18.037-2.09 1.022-2.09 2.201v.916m7.5 0a48.667 48.667 0 00-7.5 0" />
-              </svg>
+              <Icon name="trash" size="sm" />
             </button>
           </div>
         </div>
@@ -171,15 +163,11 @@
             @click="removeOption(index)"
             class="rounded-lg p-1.5 text-gray-500 hover:bg-red-50 hover:text-red-600"
           >
-            <svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
-              <path stroke-linecap="round" stroke-linejoin="round" d="M6 18L18 6M6 6l12 12" />
-            </svg>
+            <Icon name="x" size="sm" :stroke-width="2" />
           </button>
         </div>
         <button type="button" @click="addOption" class="btn btn-secondary btn-sm">
-          <svg class="mr-1 h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
-            <path stroke-linecap="round" stroke-linejoin="round" d="M12 4.5v15m7.5-7.5h-15" />
-          </svg>
+          <Icon name="plus" size="sm" class="mr-1" :stroke-width="2" />
           {{ t('admin.users.attributes.addOption') }}
         </button>
       </div>
@@ -256,6 +244,7 @@ import { adminAPI } from '@/api/admin'
 import type { UserAttributeDefinition, UserAttributeType, UserAttributeOption } from '@/types'
 import BaseDialog from '@/components/common/BaseDialog.vue'
 import ConfirmDialog from '@/components/common/ConfirmDialog.vue'
+import Icon from '@/components/icons/Icon.vue'
 import Select from '@/components/common/Select.vue'
 
 const { t } = useI18n()