feat: system prompt KV caching for SimpleEngine#175

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Thump604 wants to merge 2 commits intowaybarrios:mainfrom

Thump604:feat/system-prompt-kv-cache

Commits on Mar 17, 2026

feat: MLLM+MTP per-request routing for text and vision
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Commits on Mar 18, 2026

feat: system prompt KV caching for SimpleEngine MTP text path
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