add composer-unused, comprehensive docs, and project restructure

- Add icanhazstring/composer-unused as dev dependency for dependency hygiene checks
- Add German documentation (docs/) covering architecture, conventions, workflows, and developer checklists
- Add API layer (ApiAuth, ApiBootstrap, ApiResponse), audit, scheduler, custom fields, and SSO services
- Add Microsoft OIDC SSO, API token management, and user lifecycle features
- Add swagger-ui vendor integration and OpenAPI spec
- Add production Docker setup and bin/ scripts
- Update composer dependencies, config, templates, and frontend assets throughout

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/Service/UserServicePasswordTest.php

@@ -1,49 +1,33 @@
 <?php
-namespace MintyPHP\Service;
-
-if (!function_exists(__NAMESPACE__ . '\\t')) {
-    function t($string, ...$arguments)
-    {
-        $string = (string) $string;
-        return $arguments ? sprintf($string, ...$arguments) : $string;
-    }
-}
 
 namespace MintyPHP\Tests\Service;
 
 use MintyPHP\Service\User\UserService;
 use PHPUnit\Framework\TestCase;
-use ReflectionMethod;
 
 class UserServicePasswordTest extends TestCase
 {
-    private function validate(string $password, string $password2, bool $required, ?string $email = null): array
-    {
-        $method = new ReflectionMethod(UserService::class, 'validatePasswordStrength');
-        return $method->invoke(null, $password, $password2, $required, $email);
-    }
-
     public function testRequiresPasswordWhenRequired(): void
     {
-        $errors = $this->validate('', '', true, 'test@example.com');
+        $errors = UserService::validatePassword('', '', true, 'test@example.com');
         $this->assertNotEmpty($errors);
     }
 
     public function testRejectsMismatch(): void
     {
-        $errors = $this->validate('Abcd1234$efg', 'Abcd1234$xxx', true, 'test@example.com');
+        $errors = UserService::validatePassword('Abcd1234$efg', 'Abcd1234$xxx', true, 'test@example.com');
         $this->assertNotEmpty($errors);
     }
 
     public function testAcceptsStrongPassword(): void
     {
-        $errors = $this->validate('StrongPass1!', 'StrongPass1!', true, 'test@example.com');
+        $errors = UserService::validatePassword('StrongPass1!', 'StrongPass1!', true, 'test@example.com');
         $this->assertSame([], $errors);
     }
 
     public function testRejectsPasswordContainingEmail(): void
     {
-        $errors = $this->validate('test@example.comA1!', 'test@example.comA1!', true, 'test@example.com');
+        $errors = UserService::validatePassword('test@example.comA1!', 'test@example.comA1!', true, 'test@example.com');
         $this->assertNotEmpty($errors);
     }
 }