Replace 8× repeated per-type if-blocks in `queryDatabaseByUuidWithinTeam`
and `queryResourcesByUuid` with a single loop over the new
`STANDALONE_DATABASE_MODELS` constant.
Add unit tests to guard the registry against drift (keys mirror
`DATABASE_TYPES`, every entry is a valid Eloquent model with `team()`),
and feature tests covering team-ownership, wrong-team, and unknown-UUID
cases for `queryDatabaseByUuidWithinTeam`.
