Fix Laravel 5.5 compatibility issues - view helpers, collections, and auth routes

- Replace {{ url() }} with {{ url('/') }} in all blade templates to fix object-to-string conversion errors
- Update TeamStoreModel::selectTeamStoreGroupByCartKey() to use first() instead of get() for Laravel 5.5 Collections
- Fix TeamStoreController to access object properties directly instead of using array syntax [0]
- Update authentication routes to use Laravel 5.5 method names (showLoginForm, login, logout)
- Update login/register links from /auth/login to /login throughout views (navbar, app, auth pages)
- Verify cart, login, and register pages working with HTTP 200 status

bootstrap/cache/packages.php

@@ -0,0 +1,16 @@
+<?php return array (
+  'nesbot/carbon' => 
+  array (
+    'providers' => 
+    array (
+      0 => 'Carbon\\Laravel\\ServiceProvider',
+    ),
+  ),
+  'webpatser/laravel-uuid' => 
+  array (
+    'aliases' => 
+    array (
+      'Uuid' => 'Webpatser\\Uuid\\Uuid',
+    ),
+  ),
+);