feat(dllm): purego backend scaffold over the dllm.cpp C-ABI

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Binds the 9-symbol flat C-ABI of dllm.cpp (DiffusionGemma engine) via
purego: typed wrappers with correct string ownership (malloc'd returns
freed via dllm_capi_free_string, borrowed last_error never freed),
once-allocated stream-callback trampolines, and a gated Ginkgo binding
smoke against the tiny fixture model.

Assisted-by: Claude Code (Fable 5)
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

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