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/user/UserAttributeForm.vue

@@ -52,18 +52,12 @@
       />
 
       <!-- Select -->
-      <select
+      <Select
         v-else-if="attr.type === 'select'"
         v-model="localValues[attr.id]"
-        :required="attr.required"
-        class="input"
+        :options="attr.options || []"
         @change="emitChange"
-      >
-        <option value="">{{ t('common.selectOption') }}</option>
-        <option v-for="opt in attr.options" :key="opt.value" :value="opt.value">
-          {{ opt.label }}
-        </option>
-      </select>
+      />
 
       <!-- Multi-Select (Checkboxes) -->
       <div v-else-if="attr.type === 'multi_select'" class="space-y-2">
@@ -102,6 +96,7 @@ import { ref, watch, onMounted } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { adminAPI } from '@/api/admin'
 import type { UserAttributeDefinition, UserAttributeValuesMap } from '@/types'
+import Select from '@/components/common/Select.vue'
 
 const { t } = useI18n()
 

frontend/src/components/user/UserAttributesConfigModal.vue

@@ -142,11 +142,10 @@
       <!-- Type -->
       <div>
         <label class="input-label">{{ t('admin.users.attributes.type') }}</label>
-        <select v-model="form.type" class="input" required>
-          <option v-for="type in attributeTypes" :key="type" :value="type">
-            {{ t(`admin.users.attributes.types.${type}`) }}
-          </option>
-        </select>
+        <Select
+          v-model="form.type"
+          :options="attributeTypes.map(type => ({ value: type, label: t(`admin.users.attributes.types.${type}`) }))"
+        />
       </div>
 
       <!-- Options (for select/multi_select) -->
@@ -257,6 +256,7 @@ import { adminAPI } from '@/api/admin'
 import type { UserAttributeDefinition, UserAttributeType, UserAttributeOption } from '@/types'
 import BaseDialog from '@/components/common/BaseDialog.vue'
 import ConfirmDialog from '@/components/common/ConfirmDialog.vue'
+import Select from '@/components/common/Select.vue'
 
 const { t } = useI18n()
 const appStore = useAppStore()