feat(build): add fmt/lint/test tasks

frontend/eslint.config.js

@@ -0,0 +1,21 @@
+import { defineConfig } from "eslint/config";
+import js from "@eslint/js";
+
+export default defineConfig([
+  {
+    files: ["**/*.js", "**/*.ts", "**/*.jsx", "**/*.tsx"], // Adjust file patterns as needed
+    ignores: ["dist/**"],
+    plugins: {
+      js,
+    },
+    extends: [
+      js.configs.recommended, // Basic recommended rules
+      // Add other configurations or plugins here (e.g., 'plugin:react/recommended')
+    ],
+    rules: {
+      // Customize or add specific rules here
+      "no-unused-vars": "warn",
+      "no-undef": "warn",
+    },
+  },
+]);