fix: zero-value fallback — integer→0, boolean→false; modify uses WithDefaults

provider/internal/resources_core/crud.go

@@ -58,7 +58,7 @@ func UpdateResourceWithTimeout(ctx context.Context, client *core.UniversalClient
 	if err != nil {
 		return err
 	}
-	return client.RunInstanceOperationUniversal(ctxWithTimeout, instanceID, "modify", params)
+	return client.RunInstanceOperationUniversalWithDefaults(ctxWithTimeout, instanceID, "modify", params)
 }
 
 // DeleteResource runs destroy behavior (suspend/state-only) for instance resources.