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/profile/ProfileInfoCard.vue

@@ -30,38 +30,14 @@
     <div class="px-6 py-4">
       <div class="space-y-3">
         <div class="flex items-center gap-3 text-sm text-gray-600 dark:text-gray-400">
-          <svg
-            class="h-4 w-4 text-gray-400 dark:text-gray-500"
-            fill="none"
-            viewBox="0 0 24 24"
-            stroke="currentColor"
-            stroke-width="1.5"
-          >
-            <path
-              stroke-linecap="round"
-              stroke-linejoin="round"
-              d="M21.75 6.75v10.5a2.25 2.25 0 01-2.25 2.25h-15a2.25 2.25 0 01-2.25-2.25V6.75m19.5 0A2.25 2.25 0 0019.5 4.5h-15a2.25 2.25 0 00-2.25 2.25m19.5 0v.243a2.25 2.25 0 01-1.07 1.916l-7.5 4.615a2.25 2.25 0 01-2.36 0L3.32 8.91a2.25 2.25 0 01-1.07-1.916V6.75"
-            />
-          </svg>
+          <Icon name="mail" size="sm" class="text-gray-400 dark:text-gray-500" />
           <span class="truncate">{{ user?.email }}</span>
         </div>
         <div
           v-if="user?.username"
           class="flex items-center gap-3 text-sm text-gray-600 dark:text-gray-400"
         >
-          <svg
-            class="h-4 w-4 text-gray-400 dark:text-gray-500"
-            fill="none"
-            viewBox="0 0 24 24"
-            stroke="currentColor"
-            stroke-width="1.5"
-          >
-            <path
-              stroke-linecap="round"
-              stroke-linejoin="round"
-              d="M15.75 6a3.75 3.75 0 11-7.5 0 3.75 3.75 0 017.5 0zM4.501 20.118a7.5 7.5 0 0114.998 0A17.933 17.933 0 0112 21.75c-2.676 0-5.216-.584-7.499-1.632z"
-            />
-          </svg>
+          <Icon name="user" size="sm" class="text-gray-400 dark:text-gray-500" />
           <span class="truncate">{{ user.username }}</span>
         </div>
       </div>
@@ -71,6 +47,7 @@
 
 <script setup lang="ts">
 import { useI18n } from 'vue-i18n'
+import Icon from '@/components/icons/Icon.vue'
 import type { User } from '@/types'
 
 defineProps<{