🔥 Add initial database migrations, seeders, and factories

🎨 Refactor `Lecturer` model to include new fields and factory usage
🔧 Update `DatabaseSeeder` to handle default seeds
🛠️ Enhance `einundzwanzig` database configuration for SQLite compatibility

app/Models/Country.php

@@ -2,16 +2,21 @@
 
 namespace App\Models;
 
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Country extends Model
 {
+    use HasFactory;
+
     protected $connection = 'einundzwanzig';
 
     /** @var list<string> */
     protected $fillable = [
         'name',
+        'code',
+        'language_codes',
     ];
 
     /**