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

routes/api.php

@@ -0,0 +1,22 @@
+<?php
+
+use Illuminate\Support\Facades\Route;
+
+/*
+|--------------------------------------------------------------------------
+| API Routes
+|--------------------------------------------------------------------------
+|
+| Here is where you can register API routes for your application. These
+| routes are loaded by the RouteServiceProvider within a group which
+| is assigned the "api" middleware group. Enjoy building your API!
+|
+*/
+
+Route::group(['middleware' => ['isAuthorized', 'cors']], function () {
+    Route::post('login', 'ApiController@login');
+    Route::post('insert', 'ApiController@insert');
+    Route::get('tracking', 'ApiController@getTrackingStatus');
+    Route::get('order-status', 'ApiController@getOrderStatus');
+    Route::get('steps', 'ApiController@getSteps');
+});