Add standalone distributed Muon optimizer - #4060
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Stack from [ghstack](https://github.com/ezyang/ghstack/tree/0.15.0) (oldest at bottom): * #4060 * __->__ #4063 before: spmd_types exposes the dense DP axis as dp_shard, but Kimi 2.7 requested the legacy fsdp axis, causing Invalid mesh dim: 'fsdp' during initialization after: explicitly tells FSDP that dp_shard or efsdp is the data-parallel shard axis
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Stack from ghstack (oldest at bottom):