feat(accounts): 账户列表显示实时并发数

- 在账户列表 API 返回中添加 current_concurrency 字段
- 合并平台和类型列为 PlatformTypeBadge 组件，节省表格空间
- 新增并发状态列，显示 当前/最大 并发数，支持颜色编码

frontend/src/views/admin/AccountsView.vue

@@ -73,29 +73,30 @@
             <span class="font-medium text-gray-900 dark:text-white">{{ value }}</span>
           </template>
 
-          <template #cell-platform="{ value }">
-            <span
-              :class="[
-                'inline-flex items-center gap-1.5 px-2.5 py-0.5 rounded-full text-xs font-medium',
-                value === 'anthropic'
-                  ? 'bg-orange-100 text-orange-700 dark:bg-orange-900/30 dark:text-orange-400'
-                  : 'bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-400'
-              ]"
-            >
-              <PlatformIcon :platform="value" size="xs" />
-              {{ value === 'anthropic' ? 'Anthropic' : 'OpenAI' }}
-            </span>
+          <template #cell-platform_type="{ row }">
+            <PlatformTypeBadge :platform="row.platform" :type="row.type" />
           </template>
 
-          <template #cell-type="{ value }">
-            <span
-              :class="[
-                'badge',
-                value === 'oauth' ? 'badge-primary' : value === 'setup-token' ? 'badge-info' : 'badge-purple'
-              ]"
-            >
-              {{ value === 'oauth' ? 'Oauth' : value === 'setup-token' ? t('admin.accounts.setupToken') : t('admin.accounts.apiKey') }}
-            </span>
+          <template #cell-concurrency="{ row }">
+            <div class="flex items-center gap-1.5">
+              <span
+                :class="[
+                  'inline-flex items-center gap-1 px-2 py-0.5 rounded-md text-xs font-medium',
+                  (row.current_concurrency || 0) >= row.concurrency
+                    ? 'bg-red-100 text-red-700 dark:bg-red-900/30 dark:text-red-400'
+                    : (row.current_concurrency || 0) > 0
+                      ? 'bg-yellow-100 text-yellow-700 dark:bg-yellow-900/30 dark:text-yellow-400'
+                      : 'bg-gray-100 text-gray-600 dark:bg-gray-800 dark:text-gray-400'
+                ]"
+              >
+                <svg class="w-3 h-3" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+                  <path stroke-linecap="round" stroke-linejoin="round" d="M3.75 6A2.25 2.25 0 016 3.75h2.25A2.25 2.25 0 0110.5 6v2.25a2.25 2.25 0 01-2.25 2.25H6a2.25 2.25 0 01-2.25-2.25V6zM3.75 15.75A2.25 2.25 0 016 13.5h2.25a2.25 2.25 0 012.25 2.25V18a2.25 2.25 0 01-2.25 2.25H6A2.25 2.25 0 013.75 18v-2.25zM13.5 6a2.25 2.25 0 012.25-2.25H18A2.25 2.25 0 0120.25 6v2.25A2.25 2.25 0 0118 10.5h-2.25a2.25 2.25 0 01-2.25-2.25V6zM13.5 15.75a2.25 2.25 0 012.25-2.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-2.25A2.25 2.25 0 0113.5 18v-2.25z" />
+                </svg>
+                <span class="font-mono">{{ row.current_concurrency || 0 }}</span>
+                <span class="text-gray-400 dark:text-gray-500">/</span>
+                <span class="font-mono">{{ row.concurrency }}</span>
+              </span>
+            </div>
           </template>
 
           <template #cell-status="{ row }">
@@ -336,7 +337,7 @@ import AccountUsageCell from '@/components/account/AccountUsageCell.vue'
 import AccountTodayStatsCell from '@/components/account/AccountTodayStatsCell.vue'
 import AccountTestModal from '@/components/account/AccountTestModal.vue'
 import GroupBadge from '@/components/common/GroupBadge.vue'
-import PlatformIcon from '@/components/common/PlatformIcon.vue'
+import PlatformTypeBadge from '@/components/common/PlatformTypeBadge.vue'
 import { formatRelativeTime } from '@/utils/format'
 
 const { t } = useI18n()
@@ -345,8 +346,8 @@ const appStore = useAppStore()
 // Table columns
 const columns = computed<Column[]>(() => [
   { key: 'name', label: t('admin.accounts.columns.name'), sortable: true },
-  { key: 'platform', label: t('admin.accounts.columns.platform'), sortable: true },
-  { key: 'type', label: t('admin.accounts.columns.type'), sortable: true },
+  { key: 'platform_type', label: t('admin.accounts.columns.platformType'), sortable: false },
+  { key: 'concurrency', label: t('admin.accounts.columns.concurrencyStatus'), sortable: false },
   { key: 'status', label: t('admin.accounts.columns.status'), sortable: true },
   { key: 'schedulable', label: t('admin.accounts.columns.schedulable'), sortable: true },
   { key: 'today_stats', label: t('admin.accounts.columns.todayStats'), sortable: false },