feat: add comprehensive i18n support across all pages

- Add i18n support to admin sidebar, breadcrumbs, and nav-footer
- Add i18n support to admin pages: system-settings, users, versions, risk-control, sessions, cloud-variables, cloud-constants
- Add i18n support to auth pages: login, register
- Add i18n support to install and profile pages
- Add i18n support to agent pages: dashboard, finance, users, apps, cards
- Replace all hard-coded Chinese text with i18n translation keys
- Add comprehensive translation keys to zh.json and en.json
- Fix date formatting to use locale-agnostic toLocaleDateString()
- Pass t function as parameter for i18n in non-component files

frontend/src/pages/agent/cards/index.vue

@@ -1,9 +1,12 @@
 <script setup lang="ts">
 import { Key, Loader2, Plus } from 'lucide-vue-next'
 import { onMounted, ref } from 'vue'
+import { useI18n } from 'vue-i18n'
 
 import api from '@/services/api'
 
+const { t } = useI18n()
+
 interface Card {
   id: number
   code: string
@@ -23,7 +26,7 @@ onMounted(async () => {
     cards.value = data || []
   }
   catch (error) {
-    console.error('获取卡密列表失败:', error)
+    console.error('Load cards failed:', error)
   }
   finally {
     loading.value = false
@@ -33,15 +36,15 @@ onMounted(async () => {
 function formatDate(dateStr: string | null) {
   if (!dateStr)
     return '-'
-  return new Date(dateStr).toLocaleDateString('zh-CN')
+  return new Date(dateStr).toLocaleDateString()
 }
 
 function getStatusBadge(status: string) {
   const map: Record<string, { label: string, class: string }> = {
-    unused: { label: '未使用', class: 'bg-green-500/10 text-green-500' },
-    used: { label: '已使用', class: 'bg-blue-500/10 text-blue-500' },
-    expired: { label: '已过期', class: 'bg-red-500/10 text-red-500' },
-    disabled: { label: '已禁用', class: 'bg-gray-500/10 text-gray-500' },
+    unused: { label: t('agent.cards.unused'), class: 'bg-green-500/10 text-green-500' },
+    used: { label: t('agent.cards.used'), class: 'bg-blue-500/10 text-blue-500' },
+    expired: { label: t('agent.cards.expired'), class: 'bg-red-500/10 text-red-500' },
+    disabled: { label: t('agent.cards.disabled'), class: 'bg-gray-500/10 text-gray-500' },
   }
   return map[status] || { label: status, class: '' }
 }
@@ -52,16 +55,16 @@ function getStatusBadge(status: string) {
     <div class="flex items-center justify-between">
       <div>
         <h1 class="text-2xl font-bold">
-          卡密管理
+          {{ t('agent.cards.title') }}
         </h1>
         <p class="text-muted-foreground">
-          管理您生成的卡密
+          {{ t('agent.cards.description') }}
         </p>
       </div>
       <UiButton as-child>
         <router-link to="/agent/cards/create">
           <Plus class="mr-2 h-4 w-4" />
-          生成卡密
+          {{ t('agent.cards.generateCards') }}
         </router-link>
       </UiButton>
     </div>
@@ -74,10 +77,10 @@ function getStatusBadge(status: string) {
 
         <div v-else-if="cards.length === 0" class="text-center py-12 text-muted-foreground">
           <Key class="size-16 mx-auto mb-4 opacity-30" />
-          <p>暂无卡密记录</p>
+          <p>{{ t('agent.cards.noCards') }}</p>
           <UiButton class="mt-4" as-child>
             <router-link to="/agent/cards/create">
-              生成卡密
+              {{ t('agent.cards.generateCards') }}
             </router-link>
           </UiButton>
         </div>
@@ -87,22 +90,22 @@ function getStatusBadge(status: string) {
             <thead class="bg-muted/50">
               <tr>
                 <th class="px-4 py-3 text-left text-sm font-medium">
-                  卡密
+                  {{ t('agent.cards.cardCode') }}
                 </th>
                 <th class="px-4 py-3 text-left text-sm font-medium">
-                  应用
+                  {{ t('agent.cards.app') }}
                 </th>
                 <th class="px-4 py-3 text-left text-sm font-medium">
-                  卡类
+                  {{ t('agent.cards.cardType') }}
                 </th>
                 <th class="px-4 py-3 text-left text-sm font-medium">
-                  状态
+                  {{ t('agent.cards.status') }}
                 </th>
                 <th class="px-4 py-3 text-left text-sm font-medium">
-                  创建时间
+                  {{ t('agent.cards.createTime') }}
                 </th>
                 <th class="px-4 py-3 text-left text-sm font-medium">
-                  使用时间
+                  {{ t('agent.cards.useTime') }}
                 </th>
               </tr>
             </thead>