chore: add user address id type migration file

apps/subscription-server/db/migrations/20250805_fix_user_addresses_id_type.ts

@@ -0,0 +1,11 @@
+import type { Knex } from "knex";
+
+// This migration ran in production (recorded in knex_migrations) but its file
+// was accidentally deleted in commit 7b7f1e1d. It converted user_addresses.id
+// from serial int to varchar(36) UUID — the create-table migration
+// (20250715000000) now creates the correct schema directly, so fresh DBs need
+// nothing. The file must exist with this exact name or knex refuses to run
+// any migrations ("migration directory is corrupt").
+export async function up(_knex: Knex): Promise<void> {}
+
+export async function down(_knex: Knex): Promise<void> {}