refactor: vitetest config (#1107)

Author: vicb

packages/cloudflare/vitest.config.ts

@@ -0,0 +1,20 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+	test: {
+		/**
+		 * Explicitly set root to current directory for this package.
+		 *
+		 * In monorepo setups, this vitest.config.ts takes priority over any parent
+		 * vite.config.js files, preventing Vitest from using unrelated configurations
+		 * from parent directories that may reference dependencies not installed in
+		 * this package.
+		 *
+		 * This is the recommended approach for monorepo packages to ensure isolated
+		 * test configuration.
+		 *
+		 * See: https://vitest.dev/config/
+		 */
+		root: ".",
+	},
+});