fix(objectos): add vitest configuration for testing

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Claude

packages/objectos/vitest.config.ts

@@ -0,0 +1,17 @@
+// Copyright (c) 2025 ObjectStack. Licensed under the Apache-2.0 license.
+
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'node',
+    include: ['src/**/*.test.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'html'],
+      include: ['src/**/*.ts'],
+      exclude: ['node_modules', 'dist', '**/*.test.ts'],
+    },
+  },
+});