fix(model_init): stream Devstral FP8 checkpoints (#3413)

* fix(model_init): stream Devstral FP8 checkpoints

Signed-off-by: Yuhe Zhang <yuhez@nvidia.com>

* fix(distributed): avoid runtime Ministral3 import

Signed-off-by: Yuhe Zhang <yuhez@nvidia.com>

* test(ci): shorten Devstral recipe smoke

Signed-off-by: Yuhe Zhang <yuhez@nvidia.com>

* fix(tokenizer): route Ministral3 through offline backend

Signed-off-by: Yuhe Zhang <yuhez@nvidia.com>

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Signed-off-by: Yuhe Zhang <yuhez@nvidia.com>