Keep the exact eventstream pins but move them to =0.61.4 so aws-runtime 1.9.4's eventstream requirement resolves, downgrade aws-sdk-s3 to 1.146.1, and echo the context ttl from S3Cache::get_ttl to match Python
Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Mirror the Redis vertical slice for S3Cache: a litellm-cache-s3 crate built on aws-sdk-s3 with path-style custom endpoints, python-identical put_object metadata (cache-control, expires, content headers), expires-aware get_object, and no-op flush/unsupported test_connection. Wire it through python-bridge config projection, facade guards, test handle, and binding dispatch, plus an in-process S3 stub and parity tests.
Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
