🔥 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/Meetup.php

@@ -3,6 +3,7 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Casts\Attribute;
+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 Spatie\Sluggable\SlugOptions;
 
 class Meetup extends Model implements HasMedia
 {
+    use HasFactory;
     use HasSlug;
     use InteractsWithMedia;
 
@@ -24,6 +26,13 @@ class Meetup extends Model implements HasMedia
     /** @var list<string> */
     protected $fillable = [
         'name',
+        'city_id',
+        'description',
+        'website',
+        'nostr_pubkey',
+        'github_data',
+        'simplified_geojson',
+        'created_by',
     ];
 
     /**