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>

lib/Http/LocaleResolver.php

@@ -3,7 +3,6 @@
 namespace MintyPHP\Http;
 
 use MintyPHP\I18n;
-use MintyPHP\Router;
 
 /**
  * Handles locale detection and URL manipulation for multi-language support.
@@ -18,7 +17,7 @@ class LocaleResolver
     {
         $this->defaultLocale = $defaultLocale ?? I18n::$defaultLocale;
         $this->availableLocales = $availableLocales ?? (defined('APP_LOCALES') ? APP_LOCALES : [$this->defaultLocale]);
-        $this->basePath = trim(parse_url(Router::getBaseUrl(), PHP_URL_PATH) ?: '/', '/');
+        $this->basePath = trim(parse_url(\MintyPHP\Router::getBaseUrl(), PHP_URL_PATH) ?: '/', '/');
     }
 
     /**
@@ -37,7 +36,7 @@ class LocaleResolver
         $path = parse_url($uri, PHP_URL_PATH) ?: '';
         $query = parse_url($uri, PHP_URL_QUERY) ?: '';
 
-        $relativePath = $this->stripBasePath($path);
+        $relativePath = Request::stripBasePath($path);
         $segments = $relativePath === '' ? [] : explode('/', $relativePath);
 
         $localeCandidate = $segments[0] ?? '';
@@ -120,21 +119,6 @@ class LocaleResolver
         return $this->defaultLocale;
     }
 
-    private function stripBasePath(string $path): string
-    {
-        $relativePath = ltrim($path, '/');
-
-        if ($this->basePath !== '' && strpos($relativePath, $this->basePath . '/') === 0) {
-            return substr($relativePath, strlen($this->basePath) + 1);
-        }
-
-        if ($this->basePath !== '' && $relativePath === $this->basePath) {
-            return '';
-        }
-
-        return $relativePath;
-    }
-
     private function looksLikeLocale(string $candidate): bool
     {
         return preg_match('/^[a-z]{2}(?:-[a-z]{2})?$/i', $candidate) === 1;