fix(import): strip file:// scheme from model path for local imports

[Dennisadira]

What

Fixes #7461.

Importing a model from a local directory (a HuggingFace checkout, or an LM Studio store) via a file:// URI produced a config whose model: field kept the scheme verbatim:

backend: mlx
parameters:
  model: file:///Users/u/.lmstudio/models/mlx-community/Qwen3-Coder-30B-A3B-Instruct-4bit

The model imported fine, but loading failed because the mlx and vllm backends treat model: as a HuggingFace repo id or local path and reject the file:// form:

Error loading MLX model: Repo id must be in the form 'repo_name' or 'namespace/repo_name':
'file:///Users/.../Qwen3-Coder-30B-A3B-Instruct-4bit'. Use repo_type argument if needed.

Both mlx and vllm were reported (vllm in the issue comments).

Fix

• Add a shared LocalModelPath helper (core/gallery/importers/helpers.go) that reduces a file:// URI to the bare filesystem path it points at, and leaves HuggingFace/HTTP URIs untouched.
• Route the importers that pass details.URI straight into the model: field for from_pretrained-style loading through it: mlx, vllm, transformers, diffusers (the latter two share the identical pattern, so fixing them here heads off the same report for those backends).

Absolute (file:///abs) and relative (file://rel) local URIs both normalize correctly; remote URIs are unchanged, so the existing remote-load path and its tests are untouched.

Tests

• Direct unit coverage for LocalModelPath (absolute, relative, HF/HTTP passthrough).
• End-to-end file:// import specs for the mlx and vllm importers asserting the emitted model: no longer carries the scheme.

All importer specs pass; go vet and gofmt clean.

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