Fix huggingface_hub >= 1.0 compatibility in BaseModel._from_pretrained

[wredan]

Problem

huggingface_hub >= 1.0 removed proxies and resume_download from the keyword arguments passed by ModelHubMixin.from_pretrained() to the user-defined _from_pretrained() hook. This causes a TypeError at model load time with any recent installation:

TypeError: BaseModel._from_pretrained() missing 2 required keyword-only
arguments: 'proxies' and 'resume_download'

Reported in #85, #89, and #90. The workarounds suggested there (downgrading huggingface_hub to 0.36.0 or hardcoding default values) are fragile and break other dependencies.

Fix

• Make proxies, resume_download, local_files_only, and token optional with None/False defaults in _from_pretrained(), matching the new ModelHubMixin contract.
• Remove proxies and resume_download from the snapshot_download() call: both parameters have been removed from snapshot_download's signature in huggingface_hub >= 1.0 and passing them would raise a TypeError there as well.

Tested with

• huggingface_hub==1.10.1 + transformers==5.5.3

Verified end-to-end: SAMAudio.from_pretrained() loads without error, model.separate() produces valid output on real audio.

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