Feat Cache role ID resolution

[Samk13]

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Description

• add RoleResolverCache wrapper for shared role-id lookups
• add resolve_role_id() and clear_role_id_cache() utilities
• invalidate role cache on role create, update, and delete
• add tests for cache hit behavior and invalidation paths

Note: I did not test it for thread safety and concurrency.

Checklist

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