huggingface: `HuggingFaceEndpoint` drops the token for dedicated Inference Endpoints (`*.endpoints.huggingface.cloud`)

### Submission checklist - [x] This is a bug, not a usage question. - [x] I added a clear and descriptive title that summarizes this issue. - [x] I used the GitHub search to find a similar question and didn't find it. - [x] I am sure that this is a bug in LangChain rather than my code. - [x] The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package). - [x] This is not related to the langchain-community package. - [x] I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS. ### Package (Required) - [ ] langchain - [ ] langchain-openai - [ ] langchain-anthropic - [ ] langchain-classic - [ ] langchain-core - [ ] langchain-model-profiles - [ ] langchain-tests - [ ] langchain-text-splitters - [ ] langchain-chroma - [ ] langchain-deepseek - [ ] langchain-exa - [ ] langchain-fireworks - [ ] langchain-groq - [x] langchain-huggingface - [ ] langchain-mistralai - [ ] langchain-nomic - [ ] langchain-ollama - [ ] langchain-openrouter - [ ] langchain-perplexity - [ ] langchain-qdrant - [ ] langchain-xai - [ ] Other / not sure / general ### Related Issues / PRs #35633 introduced the "local endpoint_url gets no token" rule; #36831 hardened the hostname check to huggingface.co / hf.space. Neither covers endpoints.huggingface.cloud. ### Reproduction Steps / Example Code (Python) ```python from unittest.mock import MagicMock, patch from langchain_huggingface.llms.huggingface_endpoint import ( HuggingFaceEndpoint, _is_huggingface_hosted_url, ) url = "https://jzgu0buei5.us-east-1.aws.endpoints.huggingface.cloud" print(_is_huggingface_hosted_url(url)) # False with patch("huggingface_hub.InferenceClient") as client, patch( "huggingface_hub.AsyncInferenceClient" ) as async_client: client.return_value = MagicMock() async_client.return_value = MagicMock() HuggingFaceEndpoint(endpoint_url=url, huggingfacehub_api_token="hf_xxx", max_new_tokens=8) print(client.call_…