fix(frontend): 优化前端组件和国际化支持

- 添加 Accept-Language 请求头支持后端翻译
- 优化账户状态指示器和测试模态框
- 简化用户属性表单和配置模态框
- 新增多个国际化翻译条目
- 重构管理视图代码，提升可维护性

frontend/src/components/account/AccountStatusIndicator.vue

@@ -52,7 +52,7 @@
       <div
         class="pointer-events-none absolute bottom-full left-1/2 z-50 mb-2 -translate-x-1/2 whitespace-nowrap rounded bg-gray-900 px-2 py-1 text-xs text-white opacity-0 transition-opacity group-hover:opacity-100 dark:bg-gray-700"
       >
-        Rate limited until {{ formatTime(account.rate_limit_reset_at) }}
+        {{ t('admin.accounts.statuses.rateLimitedUntil', { time: formatTime(account.rate_limit_reset_at) }) }}
         <div
           class="absolute left-1/2 top-full -translate-x-1/2 border-4 border-transparent border-t-gray-900 dark:border-t-gray-700"
         ></div>
@@ -77,7 +77,7 @@
       <div
         class="pointer-events-none absolute bottom-full left-1/2 z-50 mb-2 -translate-x-1/2 whitespace-nowrap rounded bg-gray-900 px-2 py-1 text-xs text-white opacity-0 transition-opacity group-hover:opacity-100 dark:bg-gray-700"
       >
-        Overloaded until {{ formatTime(account.overload_until) }}
+        {{ t('admin.accounts.statuses.overloadedUntil', { time: formatTime(account.overload_until) }) }}
         <div
           class="absolute left-1/2 top-full -translate-x-1/2 border-4 border-transparent border-t-gray-900 dark:border-t-gray-700"
         ></div>
@@ -96,9 +96,12 @@
 
 <script setup lang="ts">
 import { computed } from 'vue'
+import { useI18n } from 'vue-i18n'
 import type { Account } from '@/types'
 import { formatTime } from '@/utils/format'
 
+const { t } = useI18n()
+
 const props = defineProps<{
   account: Account
 }>()
@@ -140,12 +143,12 @@ const statusClass = computed(() => {
 // Computed: status text
 const statusText = computed(() => {
   if (!props.account.schedulable) {
-    return 'Paused'
+    return t('admin.accounts.statuses.paused')
   }
   if (isRateLimited.value || isOverloaded.value) {
-    return 'Limited'
+    return t('admin.accounts.statuses.limited')
   }
-  return props.account.status
+  return t(`admin.accounts.statuses.${props.account.status}`)
 })
 
 // Computed: tier display