Add Megatron-FSDP (mfsdp) optimizer backend#12
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Port the validated Megatron-FSDP delivery into megatron.lite as an optimizer backend (registered as BACKENDS['mfsdp']): backend, grad_norm, config, process groups, checkpoint keys, dtensor grad, optimizer, patches. Qwen3-MoE / Qwen3.5 protocols gain an optimizer='mfsdp' post-load path. Unit tests included.
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Ports the validated Megatron-FSDP delivery into megatron.lite as an optimizer backend (registered as BACKENDS['mfsdp']): backend, grad_norm, config, process groups, checkpoint keys, dtensor grad, optimizer, patches. Qwen3-MoE / Qwen3.5 protocols gain an optimizer='mfsdp' post-load path. Unit tests included; GPU smoke to follow.