feat(megatron): migrate muon optimizer to core workflow#574
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… patch Patch megatron.core.optimizer.get_megatron_optimizer to automatically dispatch to get_megatron_muon_optimizer when config.optimizer contains "muon" (e.g., "muon", "distributed_muon"), enabling muon optimizer in the backends workflow without a separate branch in MegatronTrainer.
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Patch megatron.core.optimizer.get_megatron_optimizer to automatically
dispatch to get_megatron_muon_optimizer when config.optimizer contains
"muon" (e.g., "muon", "distributed_muon"), enabling muon optimizer in
the backends workflow without a separate branch in MegatronTrainer.