Implement admin and user management foundation

tests/Feature/Models/UserTest.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace Tests\Feature\Models;
+
+use App\Models\User;
+use Database\Seeders\UserSeeder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class UserTest extends TestCase
+{
+    use RefreshDatabase;
+
+    /**
+     * Ensure the default user factory creates non-admin users.
+     */
+    public function test_user_factory_defaults_to_non_admin(): void
+    {
+        $user = User::factory()->create();
+
+        $this->assertFalse($user->is_admin);
+    }
+
+    /**
+     * Ensure the admin factory state creates admin users.
+     */
+    public function test_admin_factory_state_creates_admin_users(): void
+    {
+        $user = User::factory()->admin()->create();
+
+        $this->assertTrue($user->is_admin);
+    }
+
+    /**
+     * Ensure the user seeder creates both admin and regular users.
+     */
+    public function test_user_seeder_creates_admin_and_regular_users(): void
+    {
+        $this->seed(UserSeeder::class);
+
+        $this->assertDatabaseHas('users', [
+            'email' => 'admin@kanbangit.test',
+            'is_admin' => true,
+        ]);
+
+        $this->assertDatabaseHas('users', [
+            'email' => 'test@example.com',
+            'is_admin' => false,
+        ]);
+    }
+}