feat: add platform admin permissions

supabase/migrations/202606300005_platform_admin_permissions.sql

@@ -0,0 +1,10 @@
+alter table public.platform_users
+  add column if not exists platform_permissions jsonb not null default '{}'::jsonb;
+
+update public.platform_users
+set platform_permissions = '{"*":true}'::jsonb
+where primary_role = 'platform_admin'
+  and (platform_permissions = '{}'::jsonb or platform_permissions is null);
+
+create index if not exists idx_platform_users_platform_permissions_gin
+  on public.platform_users using gin (platform_permissions);