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/SearchInput.vue

@@ -1,19 +1,7 @@
 <template>
   <div class="relative w-full">
     <div class="pointer-events-none absolute inset-y-0 left-0 flex items-center pl-3">
-      <svg
-        class="h-5 w-5 text-gray-400"
-        fill="none"
-        stroke="currentColor"
-        viewBox="0 0 24 24"
-        stroke-width="1.5"
-      >
-        <path
-          stroke-linecap="round"
-          stroke-linejoin="round"
-          d="M21 21l-5.197-5.197m0 0A7.5 7.5 0 105.196 5.196a7.5 7.5 0 0010.607 10.607z"
-        />
-      </svg>
+      <Icon name="search" size="md" class="text-gray-400" />
     </div>
     <input
       :value="modelValue"
@@ -27,6 +15,7 @@
 
 <script setup lang="ts">
 import { useDebounceFn } from '@vueuse/core'
+import Icon from '@/components/icons/Icon.vue'
 
 const props = withDefaults(defineProps<{
   modelValue: string