fix: server settings groups tab visible to owner

Server interface had 'ownerId' (camelCase) but API returns
'owner_id' (snake_case). isOwner was always false, hiding
groups/roles/audit tabs for the server owner.

web/src/components/CreateServerModal.tsx

@@ -45,7 +45,7 @@ export function CreateServerModal({ onClose }: CreateServerModalProps) {
         id: result.id,
         name: result.name,
         icon: result.icon,
-        ownerId: result.owner_id,
+        owner_id: result.owner_id,
       };
       useServerStore.getState().addServer(newServer);
       useServerStore.getState().setActiveServer(newServer.id);