Remove temporary Shopify OAuth install routes

Token captured, routes no longer needed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

routes/web.php

@@ -1,12 +1,7 @@
 <?php
 
-use App\Http\Controllers\ShopifyInstallController;
 use Illuminate\Support\Facades\Route;
 
 Route::get('/', function () {
     return redirect('/dashboard', 301);
 });
-
-// Temporär: einmalige Shopify OAuth-Installation
-Route::get('/shopify/install',  [ShopifyInstallController::class, 'install']);
-Route::get('/shopify/callback', [ShopifyInstallController::class, 'callback']);