fix(csst_dfs_client): update success condition in write_file function

- Change the success condition from checking response code to response success flag

csst_dfs_client/plan.py

@@ -114,7 +114,7 @@ def write_file(local_file: Union[IO, str, list]) -> Result:
     for i in range(0, len(data), batch_size):
         batch_data = data[i:i + batch_size]
         response = request.post("/api/plan/file", {"plans": batch_data})
-        if response.code != 200:
+        if not response.success:
             return response
     return Result.ok_data(len(data))