Initial commit: Aplikasi Ketertiban Siswa

- Fitur: input pelanggaran, sistem poin, surat peringatan otomatis, SP progress
- Realtime notifikasi via Laravel Reverb + Echo
- Dashboard statistik, manajemen user, manajemen master data
- Login 2 kolom premium, user dropdown, pengaturan akun
- Tema biru kalem, logo sekolah dinamis, sidebar brand dinamis
- Sinkronisasi siswa dari Database Kesiswaan via API

app/Models/Setting.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Setting extends Model
+{
+    protected $fillable = ['key', 'value', 'group', 'description'];
+
+    public static function getValue(string $key, mixed $default = null): mixed
+    {
+        $setting = static::where('key', $key)->first();
+        return $setting ? $setting->value : $default;
+    }
+
+    public static function setValue(string $key, mixed $value, string $group = 'general', ?string $description = null): void
+    {
+        static::updateOrCreate(
+            ['key' => $key],
+            ['value' => $value, 'group' => $group, 'description' => $description]
+        );
+    }
+}