feat: 添加模型白名单选择器组件，同步 new-api 模型列表

- 新增 ModelWhitelistSelector.vue 支持模型白名单多选
- 新增 ModelIcon.vue 显示品牌图标（基于 @lobehub/icons）
- 新增 useModelWhitelist.ts 硬编码各平台模型列表
- 更新账号编辑表单支持模型白名单配置
- 支持 Claude/OpenAI/Gemini/智谱/百度/讯飞等主流平台

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/i18n/locales/en.ts

@@ -944,6 +944,15 @@ export default {
       actualModel: 'Actual model',
       addMapping: 'Add Mapping',
       mappingExists: 'Mapping for {model} already exists',
+      searchModels: 'Search models...',
+      noMatchingModels: 'No matching models',
+      fillRelatedModels: 'Fill related models',
+      clearAllModels: 'Clear all models',
+      customModelName: 'Custom model name',
+      enterCustomModelName: 'Enter custom model name',
+      addModel: 'Add',
+      modelExists: 'Model already exists',
+      modelCount: '{count} models',
       customErrorCodes: 'Custom Error Codes',
       customErrorCodesHint: 'Only stop scheduling for selected error codes',
       customErrorCodesWarning: