Update project structure and enhance frontend functionality

- Added a new AGENTS.md file to document the project structure and conventions.
- Updated .gitignore to include node_modules and refined cursor rules.
- Introduced new backend and frontend components for improved map interactions, including context menus and controls.
- Enhanced API composables for better admin and authentication functionalities.
- Refactored existing components for cleaner code and improved user experience.
- Updated README.md to clarify production asset serving and user setup instructions.

frontend-nuxt/composables/useAuth.ts

@@ -0,0 +1,15 @@
+import type { MeResponse } from '~/types/api'
+
+/** Auth composable: login, logout, me, OAuth, setup. Uses useMapApi internally. */
+export function useAuth() {
+  const api = useMapApi()
+
+  return {
+    login: api.login,
+    logout: api.logout,
+    me: api.me,
+    oauthLoginUrl: api.oauthLoginUrl,
+    oauthProviders: api.oauthProviders,
+    setupRequired: api.setupRequired,
+  }
+}