b11109

<details open>

metal : gate mul_mm_id src1 rescale behind ggml_prec (#29029)

* metal : gate mul_mm_id src1 rescale behind ggml_prec

Assisted-by: Claude Fable 5.1

* ggml-webgpu: reject MUL_MAT_ID when src1 precision is F32

* cuda/vulkan: reject MUL_MAT_ID in supports_op when src1 prec is F32

fix `supports_op` to return false for failing backends when the specified src1 precision is f32

Assisted-by: Claude Fable 5.1

---------

Co-authored-by: yomaytk <yoshimura.masashi.frbs@gmail.com>

</details>

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