feat(helpdesk): refactor multi-tenant BC settings and risk radar improvements

Restructure helpdesk tenant settings into per-connection config with
improved token handling. Update risk radar data endpoint and UI.
Clean up ImageUploadTrait and update architecture contract tests.

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

lib/Service/Image/ImageUploadTrait.php

@@ -180,9 +180,6 @@ trait ImageUploadTrait
             $saved = imagejpeg($dst, $targetPath, 85);
         }
 
-        imagedestroy($src);
-        imagedestroy($dst);
-
         if ($saved) {
             @chmod($targetPath, 0644);
         }
@@ -226,9 +223,6 @@ trait ImageUploadTrait
             $saved = imagepng($dst, $targetPath, 6);
         }
 
-        imagedestroy($src);
-        imagedestroy($dst);
-
         return $saved;
     }