chore: scaffold astro frontend with static output

frontend/eslint.config.js

@@ -0,0 +1,13 @@
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  { ignores: ['dist', 'node_modules', '.astro'] },
+  ...tseslint.configs.recommended,
+  {
+    rules: {
+      '@typescript-eslint/no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
+      '@typescript-eslint/no-explicit-any': 'error',
+      'no-console': ['warn', { allow: ['warn', 'error'] }],
+    },
+  },
+);