fix: Gitea Traefik routing and connection pool optimization

- Remove middleware reference from Gitea Traefik labels (caused routing issues)
- Optimize Gitea connection pool settings (MAX_IDLE_CONNS=30, authentication_timeout=180s)
- Add explicit service reference in Traefik labels
- Fix intermittent 504 timeouts by improving PostgreSQL connection handling

Fixes Gitea unreachability via git.michaelschiemer.de

src/Framework/Config/Exceptions/RequiredEnvironmentVariableException.php

@@ -4,7 +4,6 @@ declare(strict_types=1);
 
 namespace App\Framework\Config\Exceptions;
 
-use App\Framework\Exception\ExceptionContext;
 use App\Framework\Exception\FrameworkException;
 
 class RequiredEnvironmentVariableException extends FrameworkException
@@ -14,10 +13,6 @@ class RequiredEnvironmentVariableException extends FrameworkException
      */
     public function __construct(string $key)
     {
-        parent::__construct(
-            message: "Required environment variable '$key' is not set.",
-            context: ExceptionContext::forOperation('config_validation', 'Configuration')
-                ->withData(['environment_variable' => $key])
-        );
+        parent::__construct("Required environment variable '$key' is not set.");
     }
 }