CEXT-6406: add menu/custom-menu v2 sample

admin-ui-sdk/v2/menu/custom-menu/.gitignore

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+# package directories
+node_modules
+
+# build
+build
+dist
+.manifest-dist.yml
+
+# Config
+config.json
+.env*
+!.env.dist
+.aio
+
+# Adobe I/O console config
+console.json
+
+.idea
+.aws.tmp.creds.json
+.parcel-cache
+.DS_Store
+.vscode

admin-ui-sdk/v2/menu/custom-menu/README.md

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+# Custom Menu — Admin UI SDK V2
+
+Adds a custom menu item to the Adobe Commerce Admin panel that opens a page inside your App Builder application.
+
+## What you get
+
+A menu entry, **First App on App Builder**, that opens a custom page in the Commerce Admin. The page displays a welcome message along with the Adobe IMS Org ID of the signed-in admin user, demonstrating how IMS context is made available to your app.
+
+The menu definition lives in `app.commerce.config.ts`. The page component lives in `src/commerce-backend-ui-2/web-src/src/pages/main-page.tsx`.
+
+## How it works
+
+1. Merchant opens the Commerce Admin and selects **First App on App Builder** from the menu
+2. Commerce Admin loads your App Builder web app inside an iframe
+3. The app resolves the IMS context via the Admin UI SDK and renders the welcome page with the signed-in admin's IMS Org ID
+
+## Prerequisites
+
+- [Node.js](https://nodejs.org/) >= 24
+- [Adobe I/O CLI](https://developer.adobe.com/runtime/docs/guides/tools/cli_install/) (`npm install -g @adobe/aio-cli`)
+- An App Builder project on [Adobe Developer Console](https://developer.adobe.com/console/) with a workspace configured for your Commerce instance
+- Adobe Commerce >= 2.4.7 with the [Admin UI SDK module](https://developer.adobe.com/commerce/extensibility/admin-ui-sdk/) installed and enabled
+
+## Setup
+
+**1. Install dependencies**
+
+```bash
+npm install
+```
+
+**2. Connect to your App Builder workspace**
+
+```bash
+aio console org select
+aio console project select
+aio console workspace select
+aio app use -g --no-input --overwrite
+```
+
+**3. Deploy**
+
+```bash
+aio app deploy
+```
+
+**4. Associate and install on Commerce**
+
+Associate and install the app with your Commerce instance through the App Management UI in the Commerce Admin. See [App Management](https://developer.adobe.com/commerce/extensibility/app-management/) for the full walkthrough.
+
+To verify the installation, navigate to **Stores → Configuration → Adobe Services → Admin UI SDK → Configure Extensions** and check the **Installed Extensions** tab — the app should appear there once successfully installed.
+
+## More information
+
+- [Admin UI SDK — Custom Menu](https://developer.adobe.com/commerce/extensibility/admin-ui-sdk/extension-points/menu/)
+- [App Management](https://developer.adobe.com/commerce/extensibility/app-management/)

admin-ui-sdk/v2/menu/custom-menu/app.commerce.config.ts

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+/*
+ * Copyright 2026 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+
+import { defineConfig } from '@adobe/aio-commerce-lib-app/config'
+
+export default defineConfig({
+  metadata: {
+    id: "custommenu",
+    displayName: "Adobe Commerce custom menu",
+    version: "1.0.0",
+    description: "Adobe Commerce custom menu example in admin panel",
+  },
+  adminUi: {
+    menu: {
+      id: "CustomMenu::first",
+      label: "First App on App Builder",
+      pageTitle: "Adobe Commerce First App on App Builder",
+      description: "First App on App Builder",
+    },
+  },
+})

admin-ui-sdk/v2/menu/custom-menu/app.config.yaml

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+extensions:
+  # This extension is required for Admin UI. Do not remove.
+  commerce/backend-ui/2:
+    $include: src/commerce-backend-ui-2/ext.config.yaml
+
+  # This extension is required for app management. Do not remove.
+  commerce/extensibility/1:
+    $include: src/commerce-extensibility-1/ext.config.yaml

admin-ui-sdk/v2/menu/custom-menu/install.yaml

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+$schema: http://json-schema.org/draft-07/schema
+$id: https://adobe.io/schemas/app-builder-templates/1
+
+categories:
+  - action
+  - ui
+
+extensions:
+  # This extension is required for Admin UI. Do not remove.
+  - extensionPointId: commerce/backend-ui/2
+
+  # This extension is required for app management. Do not remove.
+  - extensionPointId: commerce/extensibility/1