feat(device-liveness): 运营后台设备存活监控页(卡片/筛选/掉线置顶/刷新) (#20)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---------

Co-authored-by: 陈世睿 <2839904623@qq.com>
Reviewed-on: #20
Co-authored-by: chenshirui <chenshirui@wonderable.ai>
Co-committed-by: chenshirui <chenshirui@wonderable.ai>

src/lib/types.ts

@@ -44,6 +44,39 @@ export interface DeviceOnboardingItem {
   last_completed_at: string;
 }
 
+// 设备存活监控:device_liveness 表一行 + 后端按心跳阈值派生的在线/掉线/掉线时长。
+export interface DeviceLivenessItem {
+  id: number;
+  user_id: number;
+  phone: string | null;
+  nickname: string | null;
+  device_id: string;
+  device_model: string | null; // 由 device_id 解析的机型
+  platform: string;
+  app_version: string | null;
+  registration_id: string | null; // 非空 = 可极光推送
+  ever_protected: boolean;
+  first_protected_at: string | null; // 首次开无障碍时刻(老设备为 null)
+  last_heartbeat_at: string | null;
+  last_report_protection_on: boolean;
+  liveness_state: string; // unknown / alive / silent(当前未用) / notified
+  notified_at: string | null;
+  kill_alert_pending: boolean; // 掉线召回待客户端 ack
+  created_at: string;
+  updated_at: string;
+  // 后端派生
+  online: boolean;
+  display_state: string; // online 在线 / offline 已掉线 / never 未启用
+  offline_seconds: number | null; // 掉线时长(秒);仅 offline 有值
+}
+
+export interface DeviceLivenessStats {
+  total: number;
+  online: number;
+  offline: number;
+  never: number;
+}
+
 export interface UserOverview {
   user: UserListItem;
   coin_balance: number;