Upgrade: Laravel 11, consolidación modelos App\Models\

- Actualización a Laravel 11.47.0
- Migración de modelos a namespace App\Models\
- Actualización de todos los controladores
- Actualización de configuraciones
- Documentación README.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

database/factories/UserFactory.php

@@ -1,7 +1,7 @@
 <?php
 
 /** @var \Illuminate\Database\Eloquent\Factory $factory */
-use App\User;
+use App\Models\User;
 use Illuminate\Support\Str;
 use Faker\Generator as Faker;
 

database/seeders/DatabaseSeeder.php

@@ -1,5 +1,7 @@
 <?php
 
+namespace Database\Seeders;
+
 use Illuminate\Database\Seeder;
 use Illuminate\Support\Facades\DB;
 use Carbon\Carbon;