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/diffusion/model_loader/hub_prefetch.py

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
-# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM-Omni project
 
 """Best-effort HuggingFace Hub prefetch for multi-subfolder pipelines.
 
@@ -297,7 +297,7 @@ def prefetch_subfolders(
     logger.info("Prefetching %s subfolders: %s", model, subfolders)
 
     try:
-        from huggingface_hub import snapshot_download
+        from vllm_omni.transformers_utils.repo_utils import hf_api
     except ImportError:  # pragma: no cover - huggingface_hub is a hard dep
         logger.debug("huggingface_hub unavailable; skipping prefetch of %s", model)
         return
@@ -334,7 +334,7 @@ def prefetch_subfolders(
     for attempt in range(1, _PREFETCH_MAX_ATTEMPTS + 1):
         try:
             with _repo_prefetch_lock(model):
-                snapshot_download(
+                hf_api().snapshot_download(
                     repo_id=model,
                     revision=revision,
                     allow_patterns=allow_patterns,