app.tempomusic.staff.listInviteCodes

List PDS invite codes on-demand via the PDS (`com.atproto.admin.getInviteCodes`). No local mirror — the source of truth is the PDS. Requires the caller to have the `superAdmin` role. Codes are returned as suffix-only strings (the env prefix stored under `APPVIEW_PDS_INVITE_CODE_PREFIX` has been stripped). Optional `createdBy` filter narrows the listing to codes emitted by a specific staff DID (applied server-side by the AppView — the admin endpoint has no such parameter); when omitted every code is returned.