Add vLLM-Omni library info to Hugging Face Hub requests (#5381)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

vllm_omni/model_executor/models/indextts2/s2mel/modules/bigvgan.py

@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM-Omni project
+
 # Copyright (c) 2024 NVIDIA CORPORATION.
 #   Licensed under the MIT license.
 
@@ -9,13 +12,14 @@ import os
 
 import torch
 import torch.nn as nn
-from huggingface_hub import PyTorchModelHubMixin, hf_hub_download
+from huggingface_hub import PyTorchModelHubMixin
 from torch.nn import Conv1d, ConvTranspose1d
 from torch.nn.utils import remove_weight_norm, weight_norm
 
 from vllm_omni.model_executor.models.common.alias_free_activation import AliasFreeActivation1d
 from vllm_omni.model_executor.models.common.snake_activation import Snake, SnakeBeta
 from vllm_omni.model_executor.models.indextts2.s2mel.modules.commons import AttrDict
+from vllm_omni.transformers_utils.repo_utils import hf_api
 
 # ---------------------------------------------------------------------------
 # Helpers (inlined from env.py / utils.py)
@@ -328,7 +332,7 @@ class BigVGAN(
         def _resolve(filename):
             if os.path.isdir(model_id):
                 return os.path.join(model_id, filename)
-            return hf_hub_download(
+            return hf_api().hf_hub_download(
                 repo_id=model_id,
                 filename=filename,
                 **{