feat(hstu/kvcache): integrate real FlexKV lifecycle for recsys-example KV cache#372

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Clebrate:lyl-Flexkv-integration-phase2

Commits on Apr 27, 2026

Phase2-1: add FlexKV secondary call skeleton and backend coverage
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fix(Phase2-1): align FlexKV storage manager and adapter responsibilities
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feat(phase2-1): Integrate real FlexKV lifecycle for HSTU KV cache path.
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