refactor(models): drop redundant effect dep and cast

Address review: scopeOrgId is already folded into clusterOptions (its
useMemo dep), so the effect still fires on scope changes without listing
it; and the next == null guard narrows next to number, so the cast goes.

src/pages/llmodels/forms/basic.tsx

@@ -167,8 +167,8 @@ const BasicForm: React.FC<BasicFormProps> = (props) => {
       return;
     }
     form.setFieldValue('cluster_id', next);
-    handleClusterChange?.(next as number);
+    handleClusterChange?.(next);
-  }, [scopeOrgId, clusterOptions, form, handleClusterChange]);
+  }, [clusterOptions, form, handleClusterChange]);
 
   const clusterOptionRender = (option: any) => {
     const { data } = option;