fix: remove unused DEFAULT_ID_LENGTH constant from turso-driver

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
Agent-Logs-Url: https://github.com/objectstack-ai/spec/sessions/f3d58acb-4d15-42db-a9ef-f318b266842f

Author: Copilot

packages/plugins/driver-turso/src/turso-driver.ts

@@ -16,11 +16,6 @@
 import { SqlDriver, type SqlDriverConfig } from '@objectstack/driver-sql';
 import type { Client } from '@libsql/client';
 
-/**
- * Default ID length for auto-generated IDs.
- */
-const DEFAULT_ID_LENGTH = 16;
-
 // ── Configuration Types ──────────────────────────────────────────────────────
 
 /**