chore(fetch-client): add eslint config

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ymc9

packages/clients/fetch-client/eslint.config.js

@@ -0,0 +1,4 @@
+import config from '@zenstackhq/eslint-config/base.js';
+
+/** @type {import("eslint").Linter.Config} */
+export default config;