feat: Anthropic 账号被动用量采样，页面默认展示被动数据

从上游 /v1/messages 响应头被动采集 5h/7d utilization 并存储到
Account.Extra，页面加载时直接读取本地数据而非调用外部 Usage API。
用户可点击"查询"按钮主动拉取最新数据，主动查询结果自动回写被动缓存。

后端:
- UpdateSessionWindow 合并采集 5h + 7d headers 为单次 DB 写入
- 新增 GetPassiveUsage 从 Extra 构建 UsageInfo (复用 estimateSetupTokenUsage)
- GetUsage 主动查询后 syncActiveToPassive 回写被动缓存
- passive_usage_ 前缀注册为 scheduler-neutral

前端:
- Anthropic 账号 mount/refresh 默认 source=passive
- 新增"被动采样"标签和"查询"按钮 (带 loading 动画)

frontend/src/components/account/AccountUsageCell.vue

@@ -67,6 +67,38 @@
           :resets-at="usageInfo.seven_day_sonnet.resets_at"
           color="purple"
         />
+
+        <!-- Passive sampling label + active query button -->
+        <div class="flex items-center gap-1.5 mt-0.5">
+          <span
+            v-if="usageInfo.source === 'passive'"
+            class="text-[9px] text-gray-400 dark:text-gray-500 italic"
+          >
+            {{ t('admin.accounts.usageWindow.passiveSampled') }}
+          </span>
+          <button
+            type="button"
+            class="inline-flex items-center gap-0.5 rounded px-1.5 py-0.5 text-[9px] font-medium text-blue-600 hover:bg-blue-50 dark:text-blue-400 dark:hover:bg-blue-900/30 transition-colors"
+            :disabled="activeQueryLoading"
+            @click="loadActiveUsage"
+          >
+            <svg
+              class="h-2.5 w-2.5"
+              :class="{ 'animate-spin': activeQueryLoading }"
+              fill="none"
+              stroke="currentColor"
+              viewBox="0 0 24 24"
+            >
+              <path
+                stroke-linecap="round"
+                stroke-linejoin="round"
+                stroke-width="2"
+                d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"
+              />
+            </svg>
+            {{ t('admin.accounts.usageWindow.activeQuery') }}
+          </button>
+        </div>
       </div>
 
       <!-- No data yet -->
@@ -433,6 +465,7 @@ const props = withDefaults(
 const { t } = useI18n()
 
 const loading = ref(false)
+const activeQueryLoading = ref(false)
 const error = ref<string | null>(null)
 const usageInfo = ref<AccountUsageInfo | null>(null)
 
@@ -888,14 +921,18 @@ const copyValidationURL = async () => {
   }
 }
 
-const loadUsage = async () => {
+const isAnthropicOAuthOrSetupToken = computed(() => {
+  return props.account.platform === 'anthropic' && (props.account.type === 'oauth' || props.account.type === 'setup-token')
+})
+
+const loadUsage = async (source?: 'passive' | 'active') => {
   if (!shouldFetchUsage.value) return
 
   loading.value = true
   error.value = null
 
   try {
-    usageInfo.value = await adminAPI.accounts.getUsage(props.account.id)
+    usageInfo.value = await adminAPI.accounts.getUsage(props.account.id, source)
   } catch (e: any) {
     error.value = t('common.error')
     console.error('Failed to load usage:', e)
@@ -904,6 +941,17 @@ const loadUsage = async () => {
   }
 }
 
+const loadActiveUsage = async () => {
+  activeQueryLoading.value = true
+  try {
+    usageInfo.value = await adminAPI.accounts.getUsage(props.account.id, 'active')
+  } catch (e: any) {
+    console.error('Failed to load active usage:', e)
+  } finally {
+    activeQueryLoading.value = false
+  }
+}
+
 // ===== API Key quota progress bars =====
 
 interface QuotaBarInfo {
@@ -993,7 +1041,8 @@ const formatKeyUserCost = computed(() => {
 
 onMounted(() => {
   if (!shouldAutoLoadUsageOnMount.value) return
-  loadUsage()
+  const source = isAnthropicOAuthOrSetupToken.value ? 'passive' : undefined
+  loadUsage(source)
 })
 
 watch(openAIUsageRefreshKey, (nextKey, prevKey) => {
@@ -1011,7 +1060,8 @@ watch(
     if (nextToken === prevToken) return
     if (!shouldFetchUsage.value) return
 
-    loadUsage().catch((e) => {
+    const source = isAnthropicOAuthOrSetupToken.value ? 'passive' : undefined
+    loadUsage(source).catch((e) => {
       console.error('Failed to refresh usage after manual refresh:', e)
     })
   }