Fix LocalBackend fork_checkpoint to overwrite initial LoRA for vLLM#652

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arcticfly wants to merge 13 commits intomainfrom

fix/fork-checkpoint-overwrite-step0

Commits on Apr 14, 2026

Fix type errors: declare _forked_checkpoint_dir on UnslothService
arcticfly
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Add dtype harmonisation patch for mixed bf16/fp16 LoRA on H200
arcticfly
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Fix type errors: add type ignores for unsloth runtime function signatures
arcticfly
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