🔥 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/Venue.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
@@ -16,6 +17,7 @@ use Staudenmeir\EloquentHasManyDeep\HasRelationships;
 
 class Venue extends Model implements HasMedia
 {
+    use HasFactory;
     use HasRelationships;
     use HasSlug;
     use InteractsWithMedia;
@@ -25,6 +27,11 @@ class Venue extends Model implements HasMedia
     /** @var list<string> */
     protected $fillable = [
         'name',
+        'city_id',
+        'description',
+        'address',
+        'website',
+        'created_by',
     ];
 
     /**