Add app scaffold and workflows

app/frontend/eslint.config.mjs

@@ -0,0 +1,44 @@
+import nextPlugin from "@next/eslint-plugin-next";
+import globals from "globals";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config(
+  {
+    ignores: [
+      "**/.next/**",
+      "node_modules/**",
+      "dist/**",
+      "tailwind.config.js",
+      "postcss.config.mjs",
+    ],
+  },
+  {
+    files: ["**/*.{js,jsx,ts,tsx}"],
+    extends: [
+      ...tseslint.configs.recommendedTypeChecked,
+      ...tseslint.configs.stylisticTypeChecked,
+      nextPlugin.configs.recommended,
+      nextPlugin.configs["core-web-vitals"],
+    ],
+    languageOptions: {
+      parserOptions: {
+        project: "./tsconfig.json",
+      },
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+      },
+    },
+    rules: {
+      "@typescript-eslint/consistent-type-imports": [
+        "error",
+        { prefer: "type-imports", fixStyle: "separate-type-imports" },
+      ],
+      "@typescript-eslint/no-misused-promises": [
+        "error",
+        { checksVoidReturn: false },
+      ],
+      "@typescript-eslint/no-floating-promises": "error",
+    },
+  }
+);