fix(migrate-auth-secret): exit cleanly when there are no 2FA records

The empty-records branch of `main()` returned without calling
`process.exit(0)`, leaving the Drizzle Postgres connection pool
holding the event loop open. The `migrate-auth-secret` process
then hangs indefinitely after printing "No 2FA records found,
nothing to migrate." causing the upstream `0.29.3.sh` security
migration script (which calls this via `docker exec`) to never
reach its final `docker service update` step that mounts the new
Docker Secret. Operators end up with the new secret created but
the dokploy service still configured with the hardcoded
`BETTER_AUTH_SECRET`, while believing the migration completed.

Match the success branch a few lines below which already does
`process.exit(0)`, and the pattern used in sibling scripts
`reset-password.ts` and `reset-2fa.ts`.

Closes #4392

apps/dokploy/scripts/migrate-auth-secret.ts

@@ -46,7 +46,7 @@ async function main() {
 
 	if (records.length === 0) {
 		console.log("✅ No 2FA records found, nothing to migrate.");
-		return;
+		process.exit(0);
 	}
 
 	console.log(`📦 Found ${records.length} 2FA record(s) to migrate.`);