fix: resolve PSR-4 autoloading and test failures

- Add proper Tests\ namespace to all test classes in tests/Feature and tests/Unit
  - Split RemainingModelsTest.php into separate files (PSR-4 compliance)
  - Create missing factories: MetaFactory, RemoteEmailFactory
  - Add HasFactory trait to RemoteEmail model
  - Add missing ReflectionClass imports to test files
  - Fix mass assignment issues in Meta and RemoteEmail models
  - Override database connection for RemoteEmail in testing environment
  - Fix DateTime comparison precision issues in tests

tests/Unit/Models/SettingTest.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Tests\Unit\Models;
+
+use App\Models\Setting;
+use Tests\TestCase;
+
+class SettingTest extends TestCase
+{
+    /** @test */
+    public function it_can_create_a_setting_with_factory()
+    {
+        $setting = Setting::factory()->create();
+
+        $this->assertInstanceOf(Setting::class, $setting);
+        $this->assertIsString($setting->app_name);
+        $this->assertIsString($setting->app_version);
+    }
+
+    /** @test */
+    public function it_has_correct_fillable_attributes()
+    {
+        $settingData = [
+            'app_name' => 'ZEmailnator',
+            'app_version' => '1.0.0',
+            'app_base_url' => 'https://example.com',
+            'app_admin' => 'admin@example.com',
+            'app_title' => 'Test Title',
+        ];
+
+        $setting = Setting::create($settingData);
+
+        foreach ($settingData as $key => $value) {
+            $this->assertEquals($value, $setting->$key);
+        }
+    }
+
+    /** @test */
+    public function it_stores_configuration_values()
+    {
+        $setting = Setting::factory()->create([
+            'app_name' => 'Test App',
+            'configuration_settings' => json_encode([
+                'max_emails_per_user' => 100,
+                'enable_registrations' => true,
+                'default_language' => 'en',
+            ]),
+        ]);
+
+        $this->assertEquals('Test App', $setting->app_name);
+        $this->assertIsString($setting->configuration_settings);
+        $config = json_decode($setting->configuration_settings, true);
+        $this->assertEquals(100, $config['max_emails_per_user']);
+    }
+
+    /** @test */
+    public function it_can_query_public_settings()
+    {
+        $setting1 = Setting::factory()->create(['app_name' => 'Public App']);
+        $setting2 = Setting::factory()->create(['app_name' => 'Private App']);
+
+        $allSettings = Setting::all();
+
+        $this->assertCount(2, $allSettings);
+        $this->assertIsString($allSettings->first()->app_name);
+    }
+}