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/UsageLogTest.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Tests\Unit\Models;
+
+use App\Models\UsageLog;
+use App\Models\User;
+use Tests\TestCase;
+
+class UsageLogTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->user = User::factory()->create();
+    }
+
+    /** @test */
+    public function it_can_create_a_usage_log_with_factory()
+    {
+        $usageLog = UsageLog::factory()->create();
+
+        $this->assertInstanceOf(UsageLog::class, $usageLog);
+        $this->assertIsInt($usageLog->emails_created_count);
+        $this->assertIsInt($usageLog->emails_received_count);
+    }
+
+    /** @test */
+    public function it_has_correct_fillable_attributes()
+    {
+        $usageLogData = [
+            'user_id' => $this->user->id,
+            'ip_address' => '192.168.1.1',
+            'emails_created_count' => 5,
+            'emails_received_count' => 10,
+            'emails_created_history' => json_encode(['2023-01-01 12:00:00' => 3]),
+            'emails_received_history' => json_encode(['2023-01-01 12:30:00' => 7]),
+        ];
+
+        $usageLog = UsageLog::create($usageLogData);
+
+        foreach ($usageLogData as $key => $value) {
+            $this->assertEquals($value, $usageLog->$key);
+        }
+    }
+
+    /** @test */
+    public function it_belongs_to_a_user()
+    {
+        $usageLog = UsageLog::factory()->create(['user_id' => $this->user->id]);
+
+        $this->assertInstanceOf(User::class, $usageLog->user);
+        $this->assertEquals($this->user->id, $usageLog->user->id);
+    }
+
+    /** @test */
+    public function it_tracks_different_email_counts()
+    {
+        $usageLog = UsageLog::factory()->create([
+            'emails_created_count' => 15,
+            'emails_received_count' => 25,
+        ]);
+
+        $this->assertEquals(15, $usageLog->emails_created_count);
+        $this->assertEquals(25, $usageLog->emails_received_count);
+    }
+}