MLX

[voxtral_tts] enable MLX backend #718

Job	Run time
test-mlx / test-mlx	13m 10s
test-mlx-parakeet / test-mlx-parakeet	32m 38s
test-mlx-qwen35-moe / test-mlx-qwen35-moe	10m 8s
test-mlx-stories110m / test-mlx-stories110m	1h 9m 43s
backend-tester (models) / test-mlx-backend-models	12m 7s
backend-tester (operators) / test-mlx-backend-operators	10m 12s
test-mlx-voxtral-realtime	0s
test-mlx-llm	0s
test-mlx-whisper	0s
test-mlx-voxtral	0s
	2h 27m 58s

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