Add configurable system settings service

tests/Unit/SystemSettingServiceTest.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Services\System\SystemSettingService;
+use Tests\TestCase;
+
+class SystemSettingServiceTest extends TestCase
+{
+    public function test_it_reads_system_settings_from_config(): void
+    {
+        // Override konfigurasi untuk memastikan service mengambil nilai terbaru.
+        config([
+            'system.asset.code_prefix' => 'ASTX',
+            'system.application.name' => 'Custom AMS',
+        ]);
+
+        $service = app(SystemSettingService::class);
+
+        $this->assertSame('ASTX', $service->get('asset.code_prefix'));
+        $this->assertSame('Custom AMS', $service->get('application.name'));
+        $this->assertTrue($service->get('asset.qr_enabled'));
+    }
+
+    public function test_it_can_override_runtime_settings(): void
+    {
+        $service = app(SystemSettingService::class);
+
+        $service->set('ui.date_format', 'Y-m-d');
+
+        $this->assertSame('Y-m-d', $service->get('ui.date_format'));
+        $this->assertSame('Y-m-d', config('system.ui.date_format'));
+    }
+}