fix: 并发/排队面板支持 platform/group 过滤

- 添加 platformFilter/groupIdFilter props 变化监听器，过滤条件变化时
  立即重新加载数据（修复选择平台后显示"暂无数据"的问题）
- 全栈为 getUserConcurrencyStats 添加 platform/group_id 过滤支持：
  前端 API → Handler 解析 query params → Service 层过滤逻辑
- Service 层通过账号的 group 关联反查用户的 AllowedGroups，
  与 GetConcurrencyStats 的过滤模式保持一致

frontend/src/api/admin/ops.ts

@@ -366,8 +366,16 @@ export async function getConcurrencyStats(platform?: string, groupId?: number |
   return data
 }
 
-export async function getUserConcurrencyStats(): Promise<OpsUserConcurrencyStatsResponse> {
-  const { data } = await apiClient.get<OpsUserConcurrencyStatsResponse>('/admin/ops/user-concurrency')
+export async function getUserConcurrencyStats(platform?: string, groupId?: number | null): Promise<OpsUserConcurrencyStatsResponse> {
+  const params: Record<string, any> = {}
+  if (platform) {
+    params.platform = platform
+  }
+  if (typeof groupId === 'number' && groupId > 0) {
+    params.group_id = groupId
+  }
+
+  const { data } = await apiClient.get<OpsUserConcurrencyStatsResponse>('/admin/ops/user-concurrency', { params })
   return data
 }
 

frontend/src/views/admin/ops/components/OpsConcurrencyCard.vue

@@ -265,7 +265,7 @@ async function loadData() {
   try {
     if (showByUser.value) {
       // 用户视图模式只加载用户并发数据
-      const userData = await opsAPI.getUserConcurrencyStats()
+      const userData = await opsAPI.getUserConcurrencyStats(props.platformFilter, props.groupIdFilter)
       userConcurrency.value = userData
     } else {
       // 常规模式加载账号/平台/分组数据
@@ -301,6 +301,14 @@ watch(
   }
 )
 
+// 过滤条件变化时重新加载数据
+watch(
+  [() => props.platformFilter, () => props.groupIdFilter],
+  () => {
+    loadData()
+  }
+)
+
 function getLoadBarClass(loadPct: number): string {
   if (loadPct >= 90) return 'bg-red-500 dark:bg-red-600'
   if (loadPct >= 70) return 'bg-orange-500 dark:bg-orange-600'