feat: add telegram group pricing and direct payments

scripts/supabase/direct_payment_migration.sql

@@ -0,0 +1,29 @@
+-- Direct/manual transfer checkout support.
+-- Run once in Supabase SQL editor before enabling payment_mode=direct in production.
+
+alter table public.payment_transactions
+  alter column from_address drop not null;
+
+alter table public.payment_transactions
+  add column if not exists payment_method text not null default 'wallet';
+
+do $$
+begin
+  alter table public.payment_intents
+    drop constraint if exists payment_intents_payment_mode_check;
+  alter table public.payment_intents
+    add constraint payment_intents_payment_mode_check
+    check (payment_mode in ('strict', 'flex', 'direct'));
+
+  alter table public.payment_transactions
+    drop constraint if exists payment_transactions_status_check;
+  alter table public.payment_transactions
+    add constraint payment_transactions_status_check
+    check (status in ('submitted', 'confirmed', 'failed', 'duplicate', 'refund_required'));
+
+  alter table public.payment_transactions
+    drop constraint if exists payment_transactions_payment_method_check;
+  alter table public.payment_transactions
+    add constraint payment_transactions_payment_method_check
+    check (payment_method in ('wallet', 'manual', 'direct'));
+end $$;