fix: 清理 cli.py 残留未使用 discover_local_products import

Author: Yuhan

quantclass_sync_internal/cli.py

@@ -16,7 +16,6 @@
 from . import models as models_module
 from .config import (
     build_product_plan,
-    discover_local_products,
     ensure_data_root_ready,
     load_user_config_or_raise,
     load_user_secrets_or_raise,