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/MetaTest.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace Tests\Unit\Models;
+
+use App\Models\Meta;
+use Tests\TestCase;
+
+class MetaTest extends TestCase
+{
+    /** @test */
+    public function it_can_create_a_meta_with_factory()
+    {
+        $meta = Meta::factory()->create();
+
+        $this->assertInstanceOf(Meta::class, $meta);
+        $this->assertIsString($meta->key);
+        $this->assertIsString($meta->value);
+    }
+
+    /** @test */
+    public function it_has_correct_fillable_attributes()
+    {
+        $metaData = [
+            'key' => 'total_emails_created',
+            'value' => '1500',
+        ];
+
+        $meta = Meta::create($metaData);
+
+        foreach ($metaData as $key => $value) {
+            $this->assertEquals($value, $meta->$key);
+        }
+    }
+
+    /** @test */
+    public function it_stores_key_value_pairs_correctly()
+    {
+        $meta = Meta::factory()->create([
+            'key' => 'app_version',
+            'value' => '1.2.3',
+        ]);
+
+        $this->assertEquals('app_version', $meta->key);
+        $this->assertEquals('1.2.3', $meta->value);
+    }
+
+    /** @test */
+    public function it_can_retrieve_value_by_key()
+    {
+        Meta::factory()->create(['key' => 'site_name', 'value' => 'ZEmailnator']);
+        Meta::factory()->create(['key' => 'max_emails', 'value' => '100']);
+
+        $siteName = Meta::where('key', 'site_name')->first();
+        $maxEmails = Meta::where('key', 'max_emails')->first();
+
+        $this->assertEquals('ZEmailnator', $siteName->value);
+        $this->assertEquals('100', $maxEmails->value);
+    }
+}