## Context
Role assignment validation queried PostgreSQL only to check whether a
role exists and whether `canBeAssignedToUsers` is enabled. Both values
already exist in `flatRoleMaps`.
This validation runs when inviting users and assigning a role to a user
workspace.
## What changed
- Replace the role repository lookup with `flatRoleMaps`
- Resolve the role through the existing keyed flat-map helper
- Preserve the existing role-not-found and role-not-assignable errors
- Replace unused TypeORM module wiring with the flat entity cache module
## Expected impact
On a warm workspace cache, role assignment validation uses an O(1) map
lookup and avoids a PostgreSQL round trip. Cold caches retain the normal
workspace cache recomputation behavior.
## Validation
- Typecheck reports no errors in the changed files
- Existing validation outcomes and exception codes are preserved
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Weiko
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