🔥 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

database/factories/MeetupFactory.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\City;
+use App\Models\Meetup;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<Meetup>
+ */
+class MeetupFactory extends Factory
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        $name = 'Einundzwanzig '.fake()->city();
+
+        return [
+            'city_id' => City::factory(),
+            'name' => $name,
+            'description' => fake()->paragraph(),
+            'website' => 'https://einundzwanzig.space/meetups/'.str()->slug($name),
+            'nostr_pubkey' => bin2hex(random_bytes(32)),
+            'github_data' => [
+                'repo' => 'einundzwanzig-portal',
+                'path' => 'meetups/'.str()->slug($name).'.json',
+            ],
+            'simplified_geojson' => null,
+        ];
+    }
+
+    public function vienna(): static
+    {
+        return $this->state(fn () => [
+            'name' => 'Einundzwanzig Wien',
+            'description' => 'Das Bitcoin-only Meetup in Wien. Jeden ersten Donnerstag im Monat.',
+            'website' => 'https://einundzwanzig.space/meetups/wien',
+            'nostr_pubkey' => 'f240be2b684f85cc81566f2081386af81d7427ea86250c8bde6b7a8500c761ba',
+        ]);
+    }
+
+    public function berlin(): static
+    {
+        return $this->state(fn () => [
+            'name' => 'Einundzwanzig Berlin',
+            'description' => 'Bitcoin Meetup in der Hauptstadt. Plebs willkommen.',
+            'website' => 'https://einundzwanzig.space/meetups/berlin',
+        ]);
+    }
+}