fix(frontend): 修复重构页面的遗漏问题

- 添加 en.ts 中缺失的 admin.redeem.types 翻译
- RedeemView 状态筛选器添加 expired 选项
- SubscriptionsView 用量进度条添加 null/undefined 兜底
- SubscriptionsView 添加 validity_days 表单校验
- GroupsView/ProxiesView 搜索图标添加 dark mode 样式

frontend/src/i18n/locales/en.ts

@@ -914,6 +914,7 @@ export default {
       failedToRevoke: 'Failed to revoke subscription',
       pleaseSelectUser: 'Please select a user',
       pleaseSelectGroup: 'Please select a group',
+      validityDaysRequired: 'Please enter a valid number of days (at least 1)',
       revokeConfirm:
         "Are you sure you want to revoke the subscription for '{user}'? This action cannot be undone."
     },
@@ -1652,6 +1653,11 @@ export default {
       failedToDelete: 'Failed to delete code',
       failedToDeleteUnused: 'Failed to delete unused codes',
       failedToCopy: 'Failed to copy codes',
+      types: {
+        balance: 'Balance',
+        concurrency: 'Concurrency',
+        subscription: 'Subscription'
+      },
       selectGroup: 'Select Group',
       selectGroupPlaceholder: 'Choose a subscription group',
       validityDays: 'Validity Days',

frontend/src/i18n/locales/zh.ts

@@ -991,6 +991,7 @@ export default {
       failedToRevoke: '撤销订阅失败',
       pleaseSelectUser: '请选择用户',
       pleaseSelectGroup: '请选择分组',
+      validityDaysRequired: '请输入有效的天数（至少1天）',
       revokeConfirm: "确定要撤销 '{user}' 的订阅吗？此操作无法撤销。"
     },