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/useAdminApi.ts

@@ -0,0 +1,23 @@
+/** Admin API composable. Uses useMapApi internally. */
+export function useAdminApi() {
+  const api = useMapApi()
+
+  return {
+    adminUsers: api.adminUsers,
+    adminUserByName: api.adminUserByName,
+    adminUserPost: api.adminUserPost,
+    adminUserDelete: api.adminUserDelete,
+    adminSettings: api.adminSettings,
+    adminSettingsPost: api.adminSettingsPost,
+    adminMaps: api.adminMaps,
+    adminMapPost: api.adminMapPost,
+    adminMapToggleHidden: api.adminMapToggleHidden,
+    adminWipe: api.adminWipe,
+    adminRebuildZooms: api.adminRebuildZooms,
+    adminExportUrl: api.adminExportUrl,
+    adminMerge: api.adminMerge,
+    adminWipeTile: api.adminWipeTile,
+    adminSetCoords: api.adminSetCoords,
+    adminHideMarker: api.adminHideMarker,
+  }
+}