feat: support shared external rollout endpoints - #1
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Adds generic external-engine control prefixes and an optional shared rollout endpoint, allowing Dynamo-style shared
/generaterouting while retaining per-worker SGLang-compatible controls under/engine.Validated end-to-end on AWS H100s with Slime TP=1 and three Dynamo TP=2 engines: streaming rollouts plus NCCL weight updates completed successfully.