refactor(deployment): Remove WireGuard VPN dependency and restore public service access

Remove WireGuard integration from production deployment to simplify infrastructure:
- Remove docker-compose-direct-access.yml (VPN-bound services)
- Remove VPN-only middlewares from Grafana, Prometheus, Portainer
- Remove WireGuard middleware definitions from Traefik
- Remove WireGuard IPs (10.8.0.0/24) from Traefik forwarded headers

All monitoring services now publicly accessible via subdomains:
- grafana.michaelschiemer.de (with Grafana native auth)
- prometheus.michaelschiemer.de (with Basic Auth)
- portainer.michaelschiemer.de (with Portainer native auth)

All services use Let's Encrypt SSL certificates via Traefik.

src/Framework/ExceptionHandling/ErrorKernel.php

@@ -3,7 +3,10 @@ declare(strict_types=1);
 
 namespace App\Framework\ExceptionHandling;
 
+use App\Framework\ExceptionHandling\Context\ExceptionContextProvider;
+use App\Framework\ExceptionHandling\Renderers\ResponseErrorRenderer;
 use App\Framework\ExceptionHandling\Reporter\LogReporter;
+use App\Framework\Http\Response;
 use Throwable;
 
 final readonly class ErrorKernel
@@ -25,5 +28,28 @@ final readonly class ErrorKernel
 
         return null;
     }
+
+    /**
+     * Create HTTP Response from exception without terminating execution
+     *
+     * This method enables middleware recovery patterns by returning a Response
+     * object instead of terminating the application.
+     *
+     * @param Throwable $exception Exception to render
+     * @param ExceptionContextProvider|null $contextProvider Optional WeakMap context provider
+     * @param bool $isDebugMode Enable debug information in response
+     * @return Response HTTP Response object (JSON for API, HTML for web)
+     */
+    public function createHttpResponse(
+        Throwable $exception,
+        ?ExceptionContextProvider $contextProvider = null,
+        bool $isDebugMode = false
+    ): Response {
+        // Create ResponseErrorRenderer with debug mode setting
+        $renderer = new ResponseErrorRenderer($isDebugMode);
+
+        // Generate and return Response object
+        return $renderer->createResponse($exception, $contextProvider);
+    }
 }