fix(avatar): keep BOXIM status ready during long polls

digital-avatar-app/backend/routers/takeover.py

@@ -12,6 +12,7 @@ from routers.authorizations import _require_authorization
 from routers.avatars import _require_owned_avatar
 
 router = APIRouter(tags=["分身接管"])
+BOXIM_STATUS_FRESH_SECONDS = 60
 
 
 @router.get("/avatar/{avatar_id}/takeover/status")
@@ -44,7 +45,9 @@ def get_takeover_status(
         cursor
         and cursor.initialized
         and cursor.last_polled_at
-        and cursor.last_polled_at >= datetime.utcnow() - timedelta(seconds=15)
+        # BOXIM offline-message reads can long-poll for about 20 seconds.
+        and cursor.last_polled_at
+        >= datetime.utcnow() - timedelta(seconds=BOXIM_STATUS_FRESH_SECONDS)
     ):
         status, message = "ready", "BOXIM 已连接，收到私聊消息 3 秒后自动回复"
     else: