fix postgres user role enum casts in migrations

crates/aether-data/migrations/postgres/20260509120000_add_user_groups.sql

@@ -98,5 +98,5 @@ INSERT INTO public.user_group_members (group_id, user_id)
 SELECT '00000000-0000-0000-0000-000000000001', id
 FROM public.users
 WHERE is_deleted IS FALSE
-  AND LOWER(role) <> 'admin'
+  AND LOWER(role::text) <> 'admin'
 ON CONFLICT (group_id, user_id) DO NOTHING;

crates/aether-data/migrations/postgres/20260511120000_exclude_admins_from_default_user_group.sql

@@ -1,7 +1,7 @@
 DELETE FROM public.user_group_members AS member
 USING public.users AS users
 WHERE member.user_id = users.id
-  AND LOWER(users.role) = 'admin'
+  AND LOWER(users.role::text) = 'admin'
   AND (
     member.group_id = '00000000-0000-0000-0000-000000000001'
     OR member.group_id IN (

crates/aether-data/schema/bootstrap/postgres/006_footer.sql

@@ -37,7 +37,7 @@ INSERT INTO public.user_group_members (group_id, user_id)
 SELECT '00000000-0000-0000-0000-000000000001', id
 FROM public.users
 WHERE is_deleted IS FALSE
-  AND LOWER(role) <> 'admin'
+  AND LOWER(role::text) <> 'admin'
 ON CONFLICT (group_id, user_id) DO NOTHING;
 
 SELECT pg_catalog.set_config('search_path', 'public', true);