Migrate backend to Porto architecture and fix minor bugs

- Fully transitioned the backend to the Porto architectural pattern
- Improved code organization and maintainability
- Fixed minor bugs and inconsistencies

database/factories/ScheduleFactory.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Database\Factories;
+
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+class ScheduleFactory extends Factory
+{
+    public function definition(): array
+    {
+        $fileName = $this->faker->unique()->word . '.pdf';
+
+        return [
+            'file' => [
+                [
+                    'title' => $this->faker->randomElement(['Обычное', 'Основное', 'Дополнительное', 'Экзаменационное']),
+                    'path' => 'schedules/' . $this->faker->slug . '-' . time() . '.pdf'
+                ]
+            ],
+            'educational_group_id' => \App\Models\EducationalGroup::factory(),
+            'created_at' => $this->faker->dateTimeBetween('-6 months', 'now'),
+            'updated_at' => $this->faker->dateTimeBetween('-6 months', 'now'),
+        ];
+    }
+}