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

app/Containers/Education/UI/API/Controllers/AcademicYearController.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Containers\Education\UI\API\Controllers;
+
+use App\Containers\Education\Models\AdmissionCampaign;
+use App\Ship\Controllers\Controller;
+
+class AcademicYearController extends Controller
+{
+    public function __invoke()
+    {
+        $activeCampaign = AdmissionCampaign::query()->where('status', 1)->firstOrFail();
+        return $activeCampaign->academic_year;
+    }
+}