fix: treat 200 login API response as provisional success

app/auto_login.py

@@ -160,11 +160,14 @@ class AutoLoginManager:
                 except Exception:
                     payload = None
 
-                api_ok = bool(
-                    login_resp.status == 200
-                    and isinstance(payload, dict)
-                    and payload.get("need_login") is False
-                )
+                api_ok = False
+                if login_resp.status == 200:
+                    # Some environments return non-JSON/empty body for ajax login;
+                    # if status is 200, let auth-status polling decide final success.
+                    if payload is None:
+                        api_ok = True
+                    elif isinstance(payload, dict):
+                        api_ok = payload.get("need_login") is False
                 if not api_ok:
                     debug_file = await self._dump_debug_page(page)
                     raise RuntimeError(