🔥 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/LecturerFactory.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\Lecturer;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<Lecturer>
+ */
+class LecturerFactory extends Factory
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            'name' => fake()->name(),
+            'bio' => fake()->paragraph(),
+            'pubkey' => bin2hex(random_bytes(32)),
+            'website' => fake()->url(),
+            'active' => true,
+        ];
+    }
+
+    public function markusTurm(): static
+    {
+        return $this->state(fn () => [
+            'name' => 'Markus Turm',
+            'bio' => 'Hobby Hedge Fund Manager. Bitcoin, Austrian Economics, Laissez-Faire Radical.',
+            'npub' => 'npub17fqtu2mgf7zueq2kdusgzwr2lqwhgfl2scjsez77ddag2qx8vxaq3vnr8y',
+            'pubkey' => 'f240be2b684f85cc81566f2081386af81d7427ea86250c8bde6b7a8500c761ba',
+            'website' => 'https://einundzwanzig.space',
+            'active' => true,
+        ]);
+    }
+
+    public function inactive(): static
+    {
+        return $this->state(fn () => ['active' => false]);
+    }
+}