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/components/common/PlatformTypeBadge.vue

@@ -0,0 +1,75 @@
+<template>
+  <div class="inline-flex items-center rounded-md overflow-hidden text-xs font-medium">
+    <!-- Platform part -->
+    <span
+      :class="[
+        'inline-flex items-center gap-1 px-2 py-1',
+        platformClass
+      ]"
+    >
+      <PlatformIcon :platform="platform" size="xs" />
+      <span>{{ platformLabel }}</span>
+    </span>
+    <!-- Type part -->
+    <span
+      :class="[
+        'inline-flex items-center gap-1 px-1.5 py-1',
+        typeClass
+      ]"
+    >
+      <!-- OAuth icon -->
+      <svg v-if="type === 'oauth'" 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="M15 7a2 2 0 012 2m4 0a6 6 0 01-7.743 5.743L11 17H9v2H7v2H4a1 1 0 01-1-1v-2.586a1 1 0 01.293-.707l5.964-5.964A6 6 0 1121 9z" />
+      </svg>
+      <!-- Setup Token icon -->
+      <svg v-else-if="type === 'setup-token'" 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="M9 12.75L11.25 15 15 9.75m-3-7.036A11.959 11.959 0 013.598 6 11.99 11.99 0 003 9.749c0 5.592 3.824 10.29 9 11.623 5.176-1.332 9-6.03 9-11.622 0-1.31-.21-2.571-.598-3.751h-.152c-3.196 0-6.1-1.248-8.25-3.285z" />
+      </svg>
+      <!-- API Key icon -->
+      <svg v-else 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="M15.75 5.25a3 3 0 013 3m3 0a6 6 0 01-7.029 5.912c-.563-.097-1.159.026-1.563.43L10.5 17.25H8.25v2.25H6v2.25H2.25v-2.818c0-.597.237-1.17.659-1.591l6.499-6.499c.404-.404.527-1 .43-1.563A6 6 0 1121.75 8.25z" />
+      </svg>
+      <span>{{ typeLabel }}</span>
+    </span>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue'
+import type { AccountPlatform, AccountType } from '@/types'
+import PlatformIcon from './PlatformIcon.vue'
+
+interface Props {
+  platform: AccountPlatform
+  type: AccountType
+}
+
+const props = defineProps<Props>()
+
+const platformLabel = computed(() => {
+  return props.platform === 'anthropic' ? 'Anthropic' : 'OpenAI'
+})
+
+const typeLabel = computed(() => {
+  switch (props.type) {
+    case 'oauth': return 'OAuth'
+    case 'setup-token': return 'Token'
+    case 'apikey': return 'Key'
+    default: return props.type
+  }
+})
+
+const platformClass = computed(() => {
+  if (props.platform === 'anthropic') {
+    return 'bg-orange-100 text-orange-700 dark:bg-orange-900/30 dark:text-orange-400'
+  }
+  return 'bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-400'
+})
+
+const typeClass = computed(() => {
+  if (props.platform === 'anthropic') {
+    return 'bg-orange-100 text-orange-600 dark:bg-orange-900/30 dark:text-orange-400'
+  }
+  return 'bg-emerald-100 text-emerald-600 dark:bg-emerald-900/30 dark:text-emerald-400'
+})
+</script>