fix(table): add model path for slanet-plus to resolve RapidTableError

- Import os and pathlib modules to handle file paths
- Define the path to the slanet-plus model
- Update RapidTableInput initialization to include the model path

magic_pdf/model/sub_modules/table/rapidtable/rapid_table.py

+import os
+from pathlib import Path
 import cv2
 import numpy as np
 import torch
@@ -17,7 +19,9 @@ class RapidTableModel(object):
             if torch.cuda.is_available() and table_sub_model_name == "unitable":
                 input_args = RapidTableInput(model_type=table_sub_model_name, use_cuda=True, device=get_device())
             else:
-                input_args = RapidTableInput(model_type=table_sub_model_name)
+                root_dir = Path(__file__).absolute().parent.parent.parent.parent.parent
+                slanet_plus_model_path = os.path.join(root_dir, 'resources', 'slanet_plus', 'slanet-plus.onnx')
+                input_args = RapidTableInput(model_type=table_sub_model_name, model_path=slanet_plus_model_path)
         else:
             raise ValueError(f"Invalid table_sub_model_name: {table_sub_model_name}. It must be one of {sub_model_list}")