chore(refactor): group cpu cap detection

[mudler]

Description

This pull request includes changes to the pkg/model/initializers.go file to simplify the detection and handling of llama.cpp backend variants. The most important changes include the introduction of a new variable to store the variants and the refactoring of the backend detection logic.

Improvements to backend detection:

• pkg/model/initializers.go: Added a new variable llamaCPPVariants to store llama.cpp backend variants.
• pkg/model/initializers.go: Refactored the backend detection logic to use the new llamaCPPVariants variable, simplifying the code and reducing redundancy.

Notes for Reviewers

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