feat: migrate test suite from PHPUnit to Pest

- Replace phpunit/phpunit with pestphp/pest ^3.0
- Drop scrutinizer/ocular (incompatible with Pest's symfony/console)
- Add tests/Pest.php with MockeryPHPUnitIntegration trait binding
- Extract namespace-level function stubs (config, route, dir) to
  tests/Overrides.php, loaded via autoload-dev files
- Convert all 5 test classes to Pest closure-based syntax:
  setUp() → beforeEach(), assertions → expect(), skip() for skipped tests
- Delete tests/TestCase.php (logic moved to Pest.php)
- Stubs (TokenStub, User) unchanged

tests/Pest.php

@@ -0,0 +1,5 @@
+<?php
+
+use Mockery\Adapter\Phpunit\MockeryPHPUnitIntegration;
+
+pest()->use(MockeryPHPUnitIntegration::class);