[RoadMap] External Known Issues and PRs related to Mooncake

This PR tracks known issues and ongoing developments (PRs) in support frameworks such as vLLM (omni), SGLang (omni), Tokenspeed, TensorRT-LLM, Dynamo, llm-d, etc.

Start by reviewing the external developments named in the issue: vLLM (omni), SGLang (omni), Tokenspeed, TensorRT-LLM, Dynamo, and llm-d. Done means the roadmap accurately tracks their known issues and ongoing PRs, but the issue does not identify files, tests, or specific entries to update.

Written by the indexing model from the issue text.