feat: import models via URI

[mudler]

Description

This PR is a starting point for #7114

It adds an import section by URL:

Currently covers:

• full URL files to gguf (llama-cpp), limited to single files-model (for now)
• MLX

Example specify https://huggingface.co/Qwen/Qwen3-0.6B-GGUF/blob/main/Qwen3-0.6B-Q8_0.gguf will automatically install and configure the model with llama.cpp.

It currently abstracts away to "Importers" and prepares scaffolding (moves the HF api client) to pkg as we would need to use it to parse the repository if one is provided

Todo:

• [ ] Add support for other providers (vLLM, etc)
• [ ] Add support for selection of GGUF file if adding the whole repository
• [ ] Add support for multiple files with llama.cpp (models split in different gguf files)
• [ ] Add support for GGUF with mmproj files (VL models)
• [ ] Support OCI/ollama

Notes for Reviewers

Signed commits

• [ ] Yes, I signed my commits.

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