feat(db): add subscription status fields

supabase/migrations/CL4_subscription_status_fields.sql

@@ -0,0 +1,8 @@
+alter table public.plesk_subscriptions
+add column if not exists status text default 'unknown',
+add column if not exists status_raw text,
+add column if not exists last_status_sync_at timestamptz;
+
+update public.plesk_subscriptions
+set status = 'unknown'
+where status is null;