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/lib/usePermissions.ts

@@ -28,7 +28,7 @@ export function usePermissions(serverId: string | null) {
   const roles = useRoleStore((s) => s.roles);
 
   const server = serverId ? servers.find((s) => s.id === serverId) : null;
-  const isOwner = Boolean(server && user && server.ownerId === user.id);
+  const isOwner = Boolean(server && user && server.owner_id === user.id);
 
   const memberRoles = roles.filter((r) => r.server_id === serverId);