UME: system time for alarm time_created, 48h inventory auto-sync, runtime pause/resume

- formatSystemTime for current alarm time_created\n- Background thread inventory_auto_sync (NETX_UME_SYNC_INVENTORY_AUTO_ENABLED, NETX_UME_SYNC_INVENTORY_EVERY_HOURS default 48)\n- Pause/resume for token_keepalive, alarms_current_auto_sync, inventory_auto_sync via POST /v1/ume/runtime/tasks/{task}/pause|resume\n- UmePage后台任务列操作 暂停/开始

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/types.ts

@@ -98,6 +98,7 @@ export type UmeSyncStatusResponse = {
   runtime_tasks?: Array<{
     task: string;
     status: string;
+    paused?: boolean;
     last_run_at?: string | null;
     last_error?: string;
   }>;