agent-platform release v4.31.0

Added

• (model-serving) The cache outlives a pool teardown — the serving namespace is kept while the cache is on, the claim gets a fast gp3 StorageClass of its own by default, and vLLM’s compile cache lives on the claim (VLLM_CACHE_ROOT) in #538 by @teemow

Full Changelog: https://github.com/giantswarm/agent-platform/compare/v4.30.3...v4.31.0