Delete Workspace Data

Delete Oogway data for one workspace in a single API call.

The request body carries the workspace-specific identifiers to remove (email hashes, slack team IDs, external integration IDs, OAuth client IDs, invite tokens, and device-grant user codes). Only the supplied rows that belong to cluster_id are deleted, using the same cluster-ownership guard and cluster-scoped DELETE pattern as the PR #158 bulk-DELETE endpoints.

All deletions run in one database transaction. Non-existent identifiers are silently ignored (idempotent).

Returns: True on success.